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Magic the Gathering: Duels of The Planeswalkers Rediscovering Shandalar a.k.a

If X is 4 or more, draw a card

I like the interaction between the Manaform Hellkite and the Fable of the Mirror-Breaker Flip you've set up, but maybe this would make it more effective

Each player whose coin comes up tails sacrifices a creature of their choice

When you can spend any amount of mana, that means this bounces and makes a number of tokens, similar to Aether Mutation

(9/29/2017) In a multiplayer game, if a player leaves the game, all cards that player owns leave as well, and any effects that give the player control of permanents immediately end