Is Yorvo, Lord of Garenbrig's power when it enters the battlefield 0 or 4? If you had an Experiment One on the field, and you played Yorvo, would you put a +1/+1 counter on Experiment One?
There's never a point where Yorvo is on the battlefield and it doesn't have the counter on it. It enters with the counters. It will always enter as a 4/4, not as a 0/0.
Private Mod Note
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DCI Level 2 Judge
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
Yorvo enters the battlefield with the +1/+1 counters, which means it enters as a 4/4 creature. So, yes, Experiment One’s evolve ability would trigger in this case.
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
Commander/EDH Decks:
BRG The Blood of Jund - Kresh the Bloodbraided BRG
WR The Blades of Goldnight - Gisela, Blade of Goldnight WR