Karma (T1, S) Like a fine wine left to fend for itself in the middle of a festering swamp, Karma hasn't aged well at all
It can produce multiple mana of different colors in a single tap, and in multi-color decks it frequently produces three to five mana per activation
Its ETB effect means it wont make the best commander (unless you invest heavily in ways to bounce it in mono-red), but nothing beats hitting Muxus for free thanks to Warren Instigator and Goblin Lackey
Reanimator decks typically use removal-resistant cards like these along with a whole host of cards that come back from the graveyard, making it almost impossible for opponents to remove their threats
It's a staple in the Lands deck, but occasionally appears in Punishing Abzan, Death and Taxes and even the new Eldrazi deck
They ensure the cards stay dry and clean