Boulder Jockey — ruling 1

{D} represents an additional cost, not a mana symbol. {D} can be paid for by giving up one potential land play you have remaining this turn. Boulder Jockey’s mana value is 3.

Boulder Jockey — ruling 2

To determine how many land drops you have remaining this turn, compare the number of lands you can play (which is normally one but can be increased by other effects) with the number of lands you’ve played and land drops you’ve given up this turn. If the number of lands you can play is greater, you can play a land or give up a land drop. You can’t give up a land drop you don’t have.

Boulder Jockey — ruling 3

You can never pay for {D} when it’s not your turn.

Boulder Jockey — ruling 4

Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).

Boulder Jockey — ruling 5

Playtest cards use a modified version of game symbols, such as {T} and {W}. These modified symbols should be treated as the standard symbols during play.

Boulder Jockey — ruling 6

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.

Boulder Jockey : règles, fonctionnement et interactions (MTG)

Boulder Jockey 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

( is a land drop. You may give up one potential land drop this turn to pay for .) Whenever Boulder Jockey attacks, you may pay . If you do, create a 3/3 colorless Construct artifact creature token named Boulder that's tapped and attacking. Sacrifice that token at the beginning of the next end step.

How it works : Boulder Jockey

Original English text — Wizards of the Coast / Scryfall

#1November 8, 2024· Wizards of the Coast
represents an additional cost, not a mana symbol. can be paid for by giving up one potential land play you have remaining this turn. Boulder Jockey’s mana value is 3.
No other card is named in this ruling.
#2November 8, 2024· Wizards of the Coast
To determine how many land drops you have remaining this turn, compare the number of lands you can play (which is normally one but can be increased by other effects) with the number of lands you’ve played and land drops you’ve given up this turn. If the number of lands you can play is greater, you can play a land or give up a land drop. You can’t give up a land drop you don’t have.
No other card is named in this ruling.
#3November 8, 2024· Wizards of the Coast
You can never pay for when it’s not your turn.
No other card is named in this ruling.
#4November 8, 2024· Wizards of the Coast
Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).
No other card is named in this ruling.
#5November 8, 2024· Wizards of the Coast
Playtest cards use a modified version of game symbols, such as and . These modified symbols should be treated as the standard symbols during play.
No other card is named in this ruling.
#6November 8, 2024· Wizards of the Coast
For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.
No other card is named in this ruling.