scury oak
scury oak gains a counter without other cards present to give him the +1/+1 counter. I don't know which combination is triggering this but I had my scury oak, bishop of wings and thunderbond vanguard. as soon a a token is created scury oak gets a counter and creates another token. I would expect this when using cathat's crusade, it was the whole combo idea but that happens even without it being in play.
Ranker2k#90849
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Rezzahan#77802
commented
The key is the Scurry Oak's evolve ability.When Thunderbond Vanguard enters while the Oak is already on the field, the Oak will evolve. This gets it a +1/+1 counter, and triggers the token creation. And each token created is a copy of Thunderbond Vanguard as it enters, so the new token always has higher power than the Oak, and thus the Oak gets to evolve, meaning it gets a counter. And the loop is complete.