Ill-Tempered Cyclops 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
Trample: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
Complete guide
Ill-Tempered Cyclops is a straightforward red threat that brings high impact to the Limited environment. With the Trample keyword and the ability to grow significantly in the late game, it serves as both a mid-range attacker and a potential finisher. This creature utilizes the Monstrosity mechanic to represent its growing fury as the game progresses.
What it Does
Ill-Tempered Cyclops is a 3/3 creature for four mana with Trample. Its core feature is the Monstrosity 3 activated ability, which costs six mana. When this ability resolves, if the Cyclops is not already monstrous, it receives three +1/+1 counters and gains the 'monstrous' designation. This turns the 3/3 trampler into a formidable 6/6 threat.
How it Resolves Step by Step
When you pay the six mana to activate Monstrosity, the ability goes on the stack. Upon resolution, the game checks if the creature is already monstrous. If it is not, you place three +1/+1 counters on it and it becomes monstrous. Once a creature is monstrous, it stays monstrous even if it loses all abilities or stops being a creature. You cannot make a creature monstrous a second time; if you activate the ability again while the creature is already monstrous, the ability does nothing upon resolution.
Common Mistakes
A common point of confusion is whether you can respond to the Monstrosity activation. Players can indeed respond to the activation while it is on the stack. However, if the creature is removed from the battlefield before the ability resolves, it never becomes monstrous. Additionally, remember that 'monstrous' is a status, not an ability. Effects that remove abilities (like 'lose all abilities') do not remove the monstrous status or the +1/+1 counters already placed on the Cyclops.
When to Play it
This card is best utilized in decks that can reach six mana reliably. Because it has Trample, the additional power from Monstrosity is highly effective at pushing damage through small blockers. It is an excellent mana sink for the late game when you have exhausted the spells in your hand.
Interaction examples
You have Ill-Tempered Cyclops on the battlefield and six mana available. You activate the ability. Upon resolution, since the Cyclops is not yet monstrous, it gains three +1/+1 counters. It is now a 6/6 creature with Trample and the 'monstrous' status.
If you have Roaming Throne on the battlefield with 'Cyclops' chosen, it is important to note that Monstrosity is an activated ability, not a triggered ability. Therefore, Roaming Throne does not cause the Monstrosity 3 ability to happen twice. You will still only put three +1/+1 counters on the Cyclops.
You attack with a monstrous Ill-Tempered Cyclops (6/6). Your opponent blocks with Solemn Simulacrum (2/2). Because the Cyclops has Trample, it deals 2 damage to the Golem (lethal) and the remaining 4 damage carries over to the opponent. After combat, Solemn Simulacrum's triggered ability allows the opponent to draw a card, but they still take significant damage.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Ill-Tempered Cyclops
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
No other card is named in this ruling.
- #2· Wizards of the Coast
Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
No other card is named in this ruling.
- #3· Wizards of the Coast
An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.
No other card is named in this ruling.
Legal formats
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Meta decks with Ill-Tempered Cyclops
No archived Top 8 deck with this card yet.



Roaming Throne
Solemn Simulacrum