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That is, until your competitor drops a ruthless and unexpected card to take an extra turn that leads to a game-winning play

So when your summon's time is up and it goes to the graveyard, it's going to trigger Yuna, and she'll pop three or four +1/+1 counters onto another creature, powering it up

Arena of the Ancients does shut down legendary creatures, but the effect is symmetrical, so unless you specifically craft a deck that avoids them, it's going to impact you too

The downside is that we can get wrecked by the targeted creature going away before resolution, countering the spell

For Kaldheim it was Vikings, for Adventures in the Forgotten Realms it was the Dungeons, and for Midnight Hunt it is werewolves