Taranika, Akroan Veteran

Vigilance
Whenever Taranika, Akroan Veteran attacks, untap another target creature you control. Until end of turn, that creature has base power and toughness 4/4 and gains indestructible.

"I like to think Kytheon keeps watch over all of us."

Jumpstart 2022

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Any effects that modify the target creature’s power and/or toughness without setting them to a specific number or value will apply after its base power and toughness are set, regardless of the order in which those effects were created. The same is true of counters that modify its power and toughness.

Taranika’s triggered ability can target a creature that’s already untapped. It still becomes 4/4 and gains indestructible.

Taranika’s triggered ability isn’t optional. If your only other creatures are bigger than 4/4, you’ll have to shrink one for the turn.