rarest mtg card The Most Valuable Cards You Can Open in Packs Right Now Top 10 Most Expensive Magic:

Every card in your deck has to match your commanders color identity

Many put counters on themselves when an Ally enters, like the low-to-the-ground Hada FreebladeHada Freeblade

I like it best in green decks that ramp out a bunch of 5+ cost threats, at which point Ugin lays waste to everything else (the ramp also helps play Ugin at a reasonable time)

Sigh, here's your Serra Ascendant, Serra Avatar, Sphinx's Revelation, Absorb, yadda yadda, and some cards to spend life on and then either the life gain winning conditions like Felidar Sovereign or the auto-kill Black enchantments like Sanguine Bond and Exquisite Blood