While not the strongest offerings in the Commander series, they are an improvement over last year and have a lot of interesting build-around commanders and fun new cards, so in some sense, you should probably go with whichever deck fits your play style best, if you have to choose just one
You always get cheap card advantage and you sometimes get some ramp out of it as well
Irma, Part-Time Mutant | 2 Colorless Mana, 1 Blue Mana Legendary Creature Human Mutant Shapeshifter At the beginning of combat on your turn, Irma becomes a copy of up to one other target creature you control, except her name is Irma, Part-Time Mutant, and she has this ability
card in Xyz-heavy formats, since it can reset the game state with minimal investment
Phelia, Exuberant Shepherd might be the answer blink decks need
7 Patrick Star Barktooth Warbeard This was an add choice for the Legends of Bikini Bottom drop