2R, Discard a card at random: This creature deals 2 damage to any target. If the discarded card was multicolored, this creature deals 4 damage instead.
You can't discard a card at random, see what it is, and then decide whether or not to pay the mana. Mana abilities must be activated before costs are paid. At the time you pay the cost of discarding a card, you either have enough mana to pay the {2}{R}, in which case you must continue no matter what you discarded, or you don't have enough mana to pay the {2}{R}, in which case you must back up no matter what you discarded.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Legal
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