By and large these mechanics go unused in favor of the stronger and arguably more reliable mechanics that have come to make up the backbone of key decks
These both require more resources than blue or green need, and/or they require spending the resources required to try to find the win
Anything more threatening than attacking with hatebears and faster than waiting for opponents to deck out is a potential champion in these circumstances
Honestly, the cost to do this is rather expensive, but considering that this ability is stapled onto a mana rock, it definitely passes the bar on a lot of mid-power Commander decks that have counter synergies
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Either burst him down when he hits the field, or just accept that youre playing a green elk deck now