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As for Training Grounds, it's only a one-of because it only works with about half of our levelers, since Student of Warfare, Transcendent Master, and Lighthouse Chronologist already cost one to level up

It even gives a creature +7/+7 and trample if you cast a spell with seven mana or more

The nonfoil version somehow has an even larger price discrepancy, dropping from $60 to $14

Teferi, Time Raveler Locking people from casting things on other turns means they cannot cast more than one spell every go around, while you can use flash, instants, and stuff

Phelia, Exuberant Shepherd is quite possibly an instant all-timer

With plenty of artifacts in play, you can try for an affinity strategy like Broodstar, or you can more directly harvest your toys with something like Combine Chrysalis