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Cankerbloom Cankerbloom is an altogether well-rounded card with good stats for its cost and a flexible set of abilities

The Knight is likely better, as First Strike tends to be superior to Vigilance in aggressive decks, and it puts the (not necessarily Basic) Plains onto the battlefield un tapped

Thrasios and Tymna are also very low on mana cost with mana values of 2 and 3 respectively

The loop is infinite, and thanks to the word may on this card you can just say they each have 11 million +1/+1 counters to end the madness

If youve got the mana, you can do this multiple times on the same turn, which can be game-ending