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If this causes the greatest power among creatures you control to change (for example, if you control a creature with "This creature's power is equal to the number of cards in your hand"), that new power will be used to determine the cost reduction

4 Realmwalker The Underdogs' Best Friend Any typal deck can put Realmwalker to good use

Astaroth maks R4 and Lucifugus makes R3 in addition to their powerful effects, though you often want to leave them out to disrupt the grave

Both have the chance to be great in the later game, but could also be dead cards in your hand

In Commander, mana dorks are run in the majority of green decks, so this seems like an easy ramp staple