Endrider Catalyzer — ruling 1

Start your engines! isn’t a triggered ability. Increasing your speed to 1 is something that happens as a state-based action as soon as you control a permanent with the ability. Notably, this includes gaining control of a permanent with the ability that another player controls.

Endrider Catalyzer — ruling 2

Your speed doesn’t change until a spell or ability says so, such as the inherent triggered ability that cares about opponents losing life during your turn. Notably, losing control of permanents with start your engines! doesn’t affect your speed.

Endrider Catalyzer — ruling 3

Each player tracks their speed (or lack thereof) separately. Increasing your speed has no effect on whether another player has speed.

Endrider Catalyzer — ruling 4

If an effect needs to know what a player’s speed is and that player doesn’t have a speed, their speed is considered 0.

Endrider Catalyzer — ruling 5

A player “has max speed” if their speed is 4.

Endrider Catalyzer — ruling 6

“Max speed — [ability]” means “As long as you have max speed, this object has [ability].” If the granted ability functions in a zone other than the battlefield, the max speed ability does too.

Endrider Catalyzer : règles, fonctionnement et interactions (MTG)

Endrider Catalyzer is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.) Max speed — : Add .

How it works : Endrider Catalyzer

Original English text — Wizards of the Coast / Scryfall

#1February 7, 2025· Wizards of the Coast
Start your engines! isn’t a triggered ability. Increasing your speed to 1 is something that happens as a state-based action as soon as you control a permanent with the ability. Notably, this includes gaining control of a permanent with the ability that another player controls.
No other card is named in this ruling.
#2February 7, 2025· Wizards of the Coast
Your speed doesn’t change until a spell or ability says so, such as the inherent triggered ability that cares about opponents losing life during your turn. Notably, losing control of permanents with start your engines! doesn’t affect your speed.
No other card is named in this ruling.
#3February 7, 2025· Wizards of the Coast
Each player tracks their speed (or lack thereof) separately. Increasing your speed has no effect on whether another player has speed.
No other card is named in this ruling.
#4February 7, 2025· Wizards of the Coast
If an effect needs to know what a player’s speed is and that player doesn’t have a speed, their speed is considered 0.
No other card is named in this ruling.
#5February 7, 2025· Wizards of the Coast
A player “has max speed” if their speed is 4.
No other card is named in this ruling.
#6February 7, 2025· Wizards of the Coast
“Max speed — [ability]” means “As long as you have max speed, this object has [ability].” If the granted ability functions in a zone other than the battlefield, the max speed ability does too.
No other card is named in this ruling.

Popular combos

Real combos played by the community, sorted by popularity.

#1
Marvin, Murderous Mimic + Pili-Pala + Endrider Catalyzer
Infinite colored mana
1Activate Marvin using Endrider Catalyzer's ability by tapping it, adding .
2Activate Marvin using Pili-Pala's ability by paying and untapping it, adding one mana of any color.
3Repeat.

#1
Marvin, Murderous Mimic + Pili-Pala + Endrider Catalyzer
Infinite colored mana
1Activate Marvin using Endrider Catalyzer's ability by tapping it, adding .
2Activate Marvin using Pili-Pala's ability by paying and untapping it, adding one mana of any color.
3Repeat.

#2
Rex, Cyber-Hound + Pili-Pala + Endrider Catalyzer
Infinite colored mana
1Activate Rex using Endrider Catalyzer's ability by tapping it, adding .
2Activate Rex using Pili-Pala's ability by paying and untapping it, adding one mana of any color.
3Repeat.

#3
Marvin, Murderous Mimic + Farmstead Gleaner + Endrider Catalyzer
Infinite +1/+1 counters on a creature
1Activate Marvin using Endrider Catalyzer's ability by tapping it, adding .
2Activate Marvin using Farmstead Gleaner's ability by paying and untapping it, putting a +1/+1 counter on Marvin.
3Repeat.

#4
Sword of the Paruns + Power Artifact + Endrider Catalyzer
Infinite red manaInfinite untap of creatures you controlInfinite mana creatures you control can produce
1Activate Endrider Catalyzer by tapping it, adding .
2Activate Sword of the Paruns by paying , untapping Endrider Catalyzer.
3Repeat.

#4
Sword of the Paruns + Power Artifact + Endrider Catalyzer
Infinite red manaInfinite untap of creatures you controlInfinite mana creatures you control can produce
1Activate Endrider Catalyzer by tapping it, adding .
2Activate Sword of the Paruns by paying , untapping Endrider Catalyzer.
3Repeat.

#5
Monk Gyatso + Lightning Greaves + Endrider Catalyzer
Infinite creature ETBInfinite creature LTBInfinite storm count
1Activate Lightning Greaves' equip ability by paying , targeting Endrider Catalyzer.
2Monk Gyatso triggers. Choose not to airbend Endrider Catalyzer.
3Resolve Lightning Greaves' ability, attaching it to Endrider Catalyzer.
4Activate Endrider Catalyzer by tapping it, adding
5Activate Lightning Greaves' equip ability by paying , attaching it to Monk Gyatso.
6Activate Lightning Greaves' equip ability by paying , targeting Endrider Catalyzer.
7Monk Gyatso triggers, airbending Endrider Catalyzer.
8The Lightning Greaves ability fizzles due to no longer having a legal target.

#5
Monk Gyatso + Lightning Greaves + Endrider Catalyzer
Infinite creature ETBInfinite creature LTBInfinite storm count
1Activate Lightning Greaves' equip ability by paying , targeting Endrider Catalyzer.
2Monk Gyatso triggers. Choose not to airbend Endrider Catalyzer.
3Resolve Lightning Greaves' ability, attaching it to Endrider Catalyzer.
4Activate Endrider Catalyzer by tapping it, adding
5Activate Lightning Greaves' equip ability by paying , attaching it to Monk Gyatso.
6Activate Lightning Greaves' equip ability by paying , targeting Endrider Catalyzer.
7Monk Gyatso triggers, airbending Endrider Catalyzer.
8The Lightning Greaves ability fizzles due to no longer having a legal target.

#6
Arcanis the Omnipotent + Tolarian Kraken + Endrider Catalyzer
Infinite card drawInfinite draw triggers
1Activate Endrider Catalyzer by tapping it, adding .
2Activate Arcanis's first ability by tapping it, causing you to draw three cards.
3Tolarian Kraken triggers three times. Resolve the first two triggers, causing you to pay to untap Arcanis and Endrider Catalyzer.
4Resolve the last Tolarian Kraken trigger, choosing not to pay.
5Repeat.

#6
Arcanis the Omnipotent + Tolarian Kraken + Endrider Catalyzer
Infinite card drawInfinite draw triggers
1Activate Endrider Catalyzer by tapping it, adding .
2Activate Arcanis's first ability by tapping it, causing you to draw three cards.
3Tolarian Kraken triggers three times. Resolve the first two triggers, causing you to pay to untap Arcanis and Endrider Catalyzer.
4Resolve the last Tolarian Kraken trigger, choosing not to pay.
5Repeat.

Related cards and tokens

Start Your Engines! // Max Speed

Legal formats

standardfuturehistorictimelessgladiatorpioneermodernlegacypaupervintagecommanderoathbreakerstandardbrawlbrawlcompetitivebrawlalchemypaupercommanderdueltlr

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