Rattle

Rattle is an uncommon Necrobinder attack costing 1 Energy where Osty deals 7 damage and hits an additional time for each other Osty attack this turn. As the second Osty attack, Rattle hits twice. As the third, three times. This explosive multi-hit scaling rewards dense Osty attack chains.

Rattle is devastating after Poke or Right Hand Hand set up the first Osty attack, and Flatten becomes free after Osty's first attack for even more chain potential. Sic 'Em's Summon-on-hit triggers for every Rattle hit. Calcify adds its bonus damage to each individual hit, multiplying its value.

In the Necrobinder Osty/Summon archetype, Rattle is the premier damage scaler for Osty-chain turns. Against high-HP bosses like Lagavulin Matriarch and The Insatiable, a sequence of Poke into Sic 'Em into Rattle generates 3 hits, massive Summoning, and huge total damage. Building a deck that consistently enables 3+ Osty attacks before Rattle maximizes its devastating potential.