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Dueling of course

It gets even crazier with wheels and token doublers, but even at face value, its a bonkers mana engine

Many spells are cast in a four-player game, and asking each and every opponent to pay one on every spell gets very annoying

Furthermore, when its on-play effect of enabling the player to play a Character card with a cost of 2 or less after revealing the decks top card is combined with the effect of the decks titular Leader card from Two Legends [OP-08], the player is able to essentially play any 2-cost Character card for free as soon as Ivankov enters play, thus improving the players board presence