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Whenever a creature with power equal to its toughness enters the battlefield under your control, you may pay {1}. If you do, draw a card.
If one or more static abilities that apply to a creature entering the battlefield change its power or toughness, those abilities are considered when determining whether or not Symmetry Matrix's ability triggers. The same is true for replacement effects that apply to it, such as entering the battlefield with one or more +1/+1 counters or entering the battlefield as a copy of another creature.
