Bondrewd, Sovereign of Dawn

Gangway — {x} Deal 1 damage to X targets.
Sacrifice a Child creature card: create a colorless cartridge artifact token and attach it to Bondrewd. Bondrewd gets +1/+1 for each cartridge attached to it.
As long as Bondrewd has +4/+4 this way, you
may sacrifice it. When you do, transform Mask of Bondrewd and attach all cartridges to it.
"My, my." - Bondrewd