The best piece of reanimator tech in the game, Recurring Nightmare is ridiculously good
Cut of the Profits | Illustration by Donato Giancola In laywizards terms, you can copy a spell with casualty when you cast it by paying an additional cost of sacrificing a creature with power N or greater. For example, sacrificing an Expendable Lackey for a second copy of Rooftop Nuisance
Many cards in MTG allow you to move counters from one creature to another, like Leech Bonder or Tidus, Yuna's Guardian
Theres not too much else to say about tiered, as the mechanic only appears on a handful of uncommons and commons, notably Thunder Magic
Delve MTG Mechanic Spells with delve are very powerful, but usually have a high mana cost
With a big enough board state, this can go from a middling amount of lore to game-winning amounts very quickly