Starters will provide consistency, and since your opponent will usually disrupt your plays, extenders are important to successfully combo
Keeper of the Accord : This card from Commander Legends allows you to catch up if you are behind on lands AND create 1/1 Soldier tokens if opponents have more creatures than you
Copying abilities is always fun, and Verrak, Warped Sengir and The Peregrine Dynamo both let you do so in interesting ways
If the card in your graveyard is an illegal target as Emergency Weld tries to resolve, Emergency Weld is removed from the stack and you won't create a token
Special Summon 1 "Elemental HERO" or "Neo-Spacian" Monster from your GY, but its effects are negated if it was Summoned from the GY
Except Call the Mountain Chocobo is also a noncreature spell for the spellslinger archetypes in blue and black, plus it has flashback to go do it again later