Even if collectors don't have a PSA 10 Charizard, there are plenty of vintage cards that are worth a good chunk of change
A 2/1 and a 1/1 flier is already a great deal for 2 mana, but those tokens are artifacts, which opens up many more synergistic paths, and you often get more than just that first thopter from Loyal Apprentice
Faithless Looting also has a flashback cost of three mana, which means you can pay three mana to cast it again from your graveyard before exiling it
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FORCE OF NEGATION One of the youngest but mightiest counterspells out there, Force of Negation steps things up a notch from Pact
Summon: Primal Odin Speaking of win conditions, Summon: Primal Odin can be a black wincon as well