Training looks particularly powerful on flying tokens, like those from Battle Screech and Lingering Souls
In order to really get it, you need to understand that your foes are going to each keep their most powerful creature
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I wonder if books could interact with another mechanic in the way that we have the lesson/learn pairing
Crypt is cheapter to activate but only hits a single graveyard, while Relic cantrips while wiping graveyards but also wipes your own
It would then fill its graveyard at lightning speed with the help of the dredge mechanic, generate a bunch of Zombie tokens with Bridge from Below (sometimes with the help of a sacrifice outlet like Drowned Rusalka), and then finish the game by reanimating Akroma, Angel of Wrath or Flame-Kin Zealot by flashing back Dread Return