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While taking infinite turns is the obvious one, there have been infinite damage combos with this card as well over the years

However, "game changers" and how many a deck can have is a new term

Fierce Empath $0.23 When Fierce Empath enters the battlefield, it gives you a free pass to search up something massive, often Craterhoof Behemoth in many mono-green and elf decks

The finality counter is a bit pesky, but it can be removed by some effects like Scholar of New Horizons or blinked away with Teleportation Circle or other cards

Solemn Simulacrum, Nevinyrral's Disk, Skullclamp, and Soul of New Phyrexia join Commander's Sphere and Sol Ring on the list of the 1,000 most played cards in the format

It seems like a lot, and frankly, you can probably spend one hundred mana on something else, but its still an entertaining way to win