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The Altar of Thraximundar

Mana is the most important resource in the game, even moreso than your life total or the cards in your hand

Undergrowth Search your library for a black card with converted mana cost less than or equal to the number of creature cards in your graveyard, reveal it, put it into your hand, then shuffle your library

An interesting bonus interaction is pairing Rhys with the Airbending mechanic from Avatar: The Last Airbender, which still allows you to operate at instant speed and maintain flexibility

With it being only one mana more than Cancel, or even comparably Ionize, this is a counter that has tremendous upside