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 {T} or to stop them from producing enough mana.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
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: Tap target artifact, creature, or land.
