Holly, Aetherbond Druid

Whenever another nontoken creature enters the battlefield under your control, you get {e}.
Pay {e}: Add {g}.
At the beginning of each upkeep and end step, you lose all {e}, then put that many +1/+1 counters on target creature you control.
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"The days ahead will not be easy, rest now and let the Aether bolster your spirit."