Riverfang Alchemist

Metalcraft—{r}{r}: Target creature gets +2/+0,
trample, and attacks this turn if able. Activate
this ability only if you control three or more artifacts.
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The Riverfang gnolls had long made use of stimulants
that heightened strength and aggression. Combined
with Kresnik technology, they discovered a way to
both strengthen and weaponize them.