take the initiative mtg cards token Magic | Custom Retro Style All cards will be carefully packed for safe transit Underdark Explorer · Commander Legends:

So a successful mutate doesn't count as a creature entering the battlefield to trigger Guardian Project

Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keywords (such as prowess) are triggered abilities and will use "when," "whenever," or "at" in their reminder text

This is mostly used to swap the tapped status of various permanents on the battlefield, including on your opponent's side of the board

However, if you attack one opponent with three Birds, you'll only get one effect trigger as only one player was dealt damage

If you wait until after the declare blockers step, because all combat damage is dealt at once, Yuffie won't normally deal combat damage