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You don't choose a target for Selfcraft Mechan's ability at the time it triggers

9 Silumgar, The Drifting Death This card is another version of Dragonlord Silumgar, though its effect is more similar to those of Ojutai and Dromoka from earlier in that it triggers when you go to attacks

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Even if an opponent fires off a Teferi's Protection to save them, you can just create an arbitrarily large Ballista and shoot that player down when they phase back in

Plus, in a ramp deck (which Green often is, cough, cough) you'll be able to cast big fat stuff like Lifeblood Hydra that can potentially free-cast pretty much anything you reveal