Lets say youre building Rocco, Cabaretti Caterer and your primary win condition is to assemble variations of Kiki Combo
Despite the effect of transforming Battle being a triggered ability , its controller exiles the permanent and then casts it without paying the mana cost , opening up space to interact with Battle on the stack with Make Disappear, or other counterspells, or even to bounce them on the stack, with Venser, Shaper Savant and the like
This goes against the spirit of the cards variable nature, and can too efficiently destroy units that cost more than it, while also developing the battlefield
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Kenji Tsumura Another lock on stats alone, many people have already added that Kenji is just super-fun