Not legal in Standard, Pauper, Alchemy, Standard Brawl, Pauper Commander, Old School
Notes & Rules Information
Once a player announces that they're casting a spell or activating an ability, no player may take other actions until the spell or ability has been paid for. Notably, other players can't try to tap that player's permanents to stop them from paying or to stop them from producing enough mana.
, 
: Tap target artifact, creature, or land.