Exponential Growth 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
Until end of turn, double target creature's power X times.
How it works : Exponential Growth
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
If an effect instructs you to “double” a creature’s power, that creature gets +X/+0, where X is its power as that effect begins to apply. (This is not the value of X you chose when you cast the spell)
No other card is named in this ruling.
- #2· Wizards of the Coast
Exponential Growth doubles a creature’s power sequentially, not all at the same time. For example, if X is 3 and you target a 2/2 creature, you will double its power once to 4, again to 8, and a third time to 16, making it a 16/2 creature until end of turn.
No other card is named in this ruling.
- #3· Wizards of the Coast
If a creature’s power is less than 0 when it’s doubled, instead that creature gets -X/-0, where X is how much less than 0 its power is. For example, if an effect has given a 5/5 creature -7/-0 so that it’s a -2/5 creature, doubling its power makes it a -4/5 creature.
No other card is named in this ruling.
Legal formats
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Meta decks with Exponential Growth
No archived Top 8 deck with this card yet.