Diego, Loyal Retriever

Throw — When Diego enters, each opponent creates a colorless artifact token named Ball for each time you've cast your commander from the command zone this game.

Fetch — Whenever Diego deals combat damage to a player, gain control of target artifact that player controls with mana value less than Diego's power and all artifacts they control with the same name.

At the beginning of each upkeep, you gain life equal to the number of Ball tokens you control.

"Tch tch"