Crossbow crab

Shell swap (any equipment you play you can immediately equip
it for free if you do crossbow crab gets +1/+3)
{t}Shell search (search your graveyard for a
artifact and equip it even if it can't be equipped)
{p/b} sacrifice a creature gain {c}{c}{c}{c}
{t} {b/r} infect target creature or target player loses
3 health and gets a Poison counter
{t} create 3 1/3 crossbow crab tokens