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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

Yet another possibility is that WotC prints some of the missing Infinity Stones as in-universe Magic cards

Creatures like Azusa, Lost but Seeking and Dryad of the Ilysian Grove that allow you to make multiple land drops give you as many triggers as lands you have to play

There's also no consequence to conceding early - in fact, if anything it's really an act of politeness to do so when you know you're stuffed

The presence of the colorless mana symbol in the cost is not required