Derevi, Empyrial Tactician [Commander 2013] Friday Night Magic 2001 or triggered ability

or triggered ability

you may create a 1/1 white Bird creature token with flying

Set: Legends Type: Legendary Creature — Shapeshifter Rare Cost: {1}{W}{U}{B} At the beginning of your upkeep

and sometimes it's right there in front of you

When you've got nothing

Derevi, Empyrial Tactician [Commander 2013] Friday Night Magic 2001 or triggered abilitySet: Commander 2013 Type: Legendary Creature Bird Wizard Mythic Cost: {G}{W}{U} Flying Whenever Derevi, Empyrial Tactician enters the battlefield or a creature you control deals combat damage to a player, you may tap or untap target permanent. {1}{G}{W}{U}: Put Derevi onto the battlefield from the command zone.