Dogsnail Engine
Artifact - Contraption
Whenever you assemble Dogsnail
Engine, target player gains life
equal to the creature types
amoung creatures they control.
(Crossbreed Labs)
Probably something like "anything that can target a player can target a planeswalker" even though it might not have an effect like discard. But things that don't "target" are left as is.
Dogsnail Engine
Artifact - Contraption
Whenever you assemble Dogsnail
Engine, target player gains life
equal to the creature types
amoung creatures they control.
(Crossbreed Labs)
At the beginning of your upkeep, if you control a Rigger
move a counter to your next sprocket...
...et's Contraptions. (sprocket
//
Dogsnail Engine
Whenever ... Dogsnail
Engine, target ...
equal to the ...
amoung creatures ...
Sounds like part of the Crossbreed Labs faction.