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The Legend of Kuruk / Avatar Kuruk The Legend of Kuruk lets you Preordain twice before it becomes a finisher in Avatar Kuruk, which acts like a Young Pyromancer

This is the going rate for the effect and often quite worthwhile, though there are stronger versions that relegate these cards to the redundancy category

Ninjas with a low ninjutsu cost like Prosperous Thief and Ingenious Infiltrator can help you save mana for flashier game-ending spells like Kotose, the Silent Spider

As for spells, mana cost doesn't matter so much as function

For tokens: use a real token card base (or a clearly labeled stand-in) plus dice for counts