mtg final fantasy celes rune knight Celes, - Magic: The Gathering—FINAL Commander #209 (English) then draw that many cards plus one Celes, Rune Knight (Borderless) Commander:

This does not affect English printings in the United States and Japanese printings of Scions & Spellcraft and Scions & Spellcraft Collector's Edition Commander decks

This provides a sacrifice outlet as well as a drain trigger, all at a very curve-friendly cost of three

Now all you need to do is cast Trazyn and give it haste, then it can immediately make infinite black mana

Deathleaper, Terror Weapon Ikoria gave us a bunch of cool keyword lords like Frondland Felidar and Quartzwood Crasher, and Deathleaper, Terror Weapon is basically your choice of haste or flash lord

Sicarian Infiltrator is one of the best creatures to showcase this mechanic

But naturally, players will also want to know what the crystal cards actually do, and while there's always a chance of the rules changing before going to launch, these concepts seem pretty set in stone