1 ring mtg card The One - Proxy Universes Beyond: The Lord of the Rings: Tales of Middle-earth One Ring Card From Magic:

A one-sided mana doubler that existed before the likes of Caged Sun or Crypt Ghast, Nirkana Revenant fueled many a powerful X spell while also being able to put opponents down with the aid of a Whispersilk Cloak or Akromas Memorial

Sire of Stagnation: Theres something to be said for a card which offers an incentive for your opponents to not play additional lands

The value of having cards in the Discard pile has becoming increasingly interesting over time and it seems Ravensburger is plotting to continue to develop the Discard pile into more than just the pile of the Player's used and banished cards

The 10th set/expansion for Disney Lorcana

Angel of Suffering On the opposite end of the scale, we have an incredibly expensive source of mill which then also requires external inputs to add even one card to your yard

Paying life for spells is really good, and it honestly has a strong enough body that it's solid on it's own