Everything you play becomes a two-for-one, so even a board wipe might not be impactful enough since youll have a fresh hand of cards
Creature - Hydra Grakmaw, Skyclave Ravager Grakmaw enters with three +1/+1 counters on it
Its also a really fun card, letting you control a rivals card, but with it being cheaper depending on how much more powerful that card is
Have a Treasure token generation build with Tireless Tracker and The Reaver Cleaver and token doublers like Primal Vigor to have enough artifacts for Straxs abilities
(By the way, cards with cheaper alternate play costs like Avatar of Fury will still trigger Kalemne.) There are multiple cards from Oath of the Gatewatch that really seem useful for Commander, generally, and Kalemne, specifically
Importantly, it can also make those tokens, even if it doesnt have any targets