"I look to the heavens for hope, but you will kneel."

Celestial Enforcer

{1}{W}, {T}: Tap target creature. Activate only if you control a creature with flying.

Foundations Jumpstart

Core Set 2021

{1}{W}, {T}: Tap target creature. Activate this ability only if you control a creature with flying.

Once you begin activating Celestial Enforcer's ability, players can't take any other actions until you're done activating it. Notably, they can't try to remove your creatures with flying to make it illegal to activate the ability.