Nahiri, Forged in Fury churns through your deck when attacking with equipped creatures, and Reyav, Master Smith turns those Bone Saws into Fireshriekers
Myr Enforcer was first released in the set Magic Online Promos, illustrated by Jim Murray
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One turn with this sliver commander and youre suddenly facing down a massive beater with vigilance, flying, and haste that destroyed an artifact on ETB
Dolmen Gate spiked in price earlier this year when Anzrag came out, and Stranglehold seems fairly niche, but can be a nice tool against tutors and extra turn steps - to make playing red feel like less of a handicap
Hoser cards Ethersworn Canonist is obviously great versus Storm decks, but its also useful against decks that want to play a ton of cheap spells in the early game (think things like Infect and Burn)