First, it passes the four mana or less test, which as we have seen, is basically the baseline for potential eternal playability
Practicum is essentially a permanent Overrun effect, which makes it fantastic in any kind of go-wide strategy, from Baylen, the Haymaker to Hakbal of the Surging Soul
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You can come back from sacrifice removal like Barter in Blood that gets past indestructible stuff
Instant Protection (CTRL to add secondary) Ramp-ish Vexing Puzzlebox Whenever you roll one or more dice, put a number of charge counters on this artifact equal to the result