He's four colors, packs four abilities, and is a 5/5, making him a rock solid card based on stats alone
Point is, you got a lot of ways to win the game
Sure, we are giving them a world of potential answers in the process, but we are taking advantage from it as well and forcing them to pitch their hands frequently forces them out of any long term plans they might be holding on to
It also finds plenty of draw, removal, counterspells and combo pieces
Most of the time you can resolve your spells and Prowess triggers in such a way to target your own creature and have it survive, but no need to take that chance if you dont have to
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