Whatever Pokmon card holder you choose, make sure it sits upright on a pallet or shelf to protect it from leaking to the floor or other moisture
Hes obviously great with other vampires the cheaper the better to get as many triggers as you can, as well as lord/pump effects, and token doublers like Anointed Procession
You do have to pay one mana for each card you're bringing back, but if you have the mana to dump into the spell, you can get a ton of outlaws back
The can't be blocked aspect is really key for commanders that rely on saboteur abilities
Keep in mind Rule 13 from the Commander rules: Abilities which refer to other cards owned outside the game (Wishes, Spawnsire, Research, Ring of Maruf) do not function in Commander without prior agreement on their scope from the playgroup
If I chose Goblin Grenade to represent every goblin out there, then Last Words flavor text represents counterspells