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Mirari's Wake is also great because it isn't just a mana ramp card, it also gives all your creatures a minor buff, making it great for Selesnya token decks

Another clever ability that mirrors the game characters function is Yuna, Hope of Spira from Final Fantasy X

Otharri, Suns Glory Otharri, Suns' Glory provides incredible pressure

From those cards, you can cast another spell with mana value less than the original for free

In the past with just Kuldotha Rebirth it usually wasnt worthwhile since your odds of drawing a Kuldotha Rebirth wasnt especially high and cards like Ornithopter and Memnite are pretty bad if they aren't turning into three 1/1 Goblin tokens, but now the odds are in favor of having one in hand every game