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This is the clearest signal

Its the only source of fixing (besides Gene Pollinator, another deceptively good card) and its also a mana sink of sorts

The Ozolith The ultimate counters card, no matter what kind of counters youre working with, thanks to its excellent leaves-the-battlefield trigger

Karrthus Do-Over

Old mana bases got rather better

Being an instant, it also lets you set up key cards right before beginning your turn, including ramp like Sol Ring, shenanigans with Vedalken Orrery, or the ability to attack or tap with an artifact creature on your turn that would normally have to wait through a full turn cycle of summoning sickness