As far as underperformers go, I have been very unexcited by the Goyf creatures, the niche cards like Goblin Bombardment or Candelabra of Thawnos, and lately, I found the Strip Mine combo to be too slow as well
Cyclonic Rift One of the most iconic staples in Commander (and also among the most groan-inducing) Cyclonic Rift manages to be one of the best board wipes in a format graced with the likes of Toxic Deluge, Farewell, and Sunfall
$ 0.49 Add to Cart 18 In Stock Foil Near Mint $ 0.29 Add to Cart Customers who bought this also bought You might also be interested in these products
Devotion accumulates incredibly fast and this becomes a potent win condition in multiples or when flickeredor, and this is my favorite, paired with Saw in Half
(Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.) When Optimus Prime dies, return it to the battlefield converted under its owners control