500 years in the future one piece booster box TCG - Trading Card Game - OP-07 which perfectly reflects that OP-07 | Future 500 Years

Mana, Ramp, Rocks and Lands Let's turn to ways to tap the Ninth Doctor other than attacking to tap and get used for his untap in your untap step

It can attack, block, get hit with creature removal spells, be sacrificed, and so on

The cost to value ratio is amazing, in the sense that you get graveyard hate that grows your own things and allows you to replicate activated effects

END STEP Did you play Fallout

Same with Lightning Bolt, Deathrite Shaman, Necropotence, Swords to Plowshares, and most every other card ever printed

Both Karns other abilities fuel it and both keep Karn very safe with either a huge +4 loyalty gain or the clean exile of a threat