For each player, choose a creature card in that player’s graveyard. Put those cards onto the battlefield under your control. They’re black Zombies in addition to their other colors and types and they gain decayed. (A creature with decayed can’t block. When it attacks, sacrifice it at end of combat.)
If any creature cards put onto the battlefield this way become permanents that aren't creatures because of another effect, those permanents won't be Zombies, but they will gain decayed.
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Decayed does not create any attacking requirements. You may choose not to attack with a creature that has decayed.
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Decayed does not grant haste. Creatures with decayed that enter the battlefield during your turn may not attack until your next turn.
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Decayed represents a static ability and a triggered ability. "Decayed" means "This creature can't block" and "When this creature attacks, sacrifice it at end of combat."
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The creatures will enter the battlefield simultaneously. They will see each other enter for the purposes of triggered abilities.
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Once a creature with decayed attacks, it will be sacrificed at end of combat, even if it no longer has decayed at that time.
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.