Some popular commanders for chaos decks that dont fit any of the above three categories are Neera, Wild Mage, Norin the Wary, and Zurzoth, Chaos Rider
Turning stuff into your graveyard into on-board presence is exactly what you want to be doing in the late game when you're flooding out
Sort Card Type Pecharunt #143Rare $0.17 Pecharunt #115 $0.20 Pecharunt #75Uncommon $0.12 Pecharunt - 129 #129Promo $1.68 Pecharunt - 149 #149Promo $0.64 Pecharunt (Poke Ball) #143Rare $0.33 Pecharunt ex #39Double Rare $9.00 Pecharunt ex #163Special Illustration Rare $30.37 Pecharunt ex - 039/064 #39Double Rare $4.70 Pecharunt ex - 039/064 #39Double Rare $0.29 Pecharunt ex - 082/064 #82Super Rare $1.38 Pecharunt ex - 085/064 #85Ultra Rare $6.99 Pecharunt ex - 090/064 #90Special Art Rare $11.03 Pecharunt ex - 092/064 #92Ultra Rare $6.48 Pecharunt ex - 093/064 #93Special Illustration Rare $26.17 Pecharunt ex - 095/064 #95Hyper Rare $21.59 Pecharunt ex - 105/187 #105Double Rare $0.24 Pecharunt ex - 219/187 #219Special Art Rare $4.63 Pecharunt ex #163Special Illustration Rare $30.37 Pecharunt ex - 093/064 #93Special Illustration Rare $26.17 Pecharunt ex - 095/064 #95Hyper Rare $21.59 Pecharunt ex - 090/064 #90Special Art Rare $11.03 Pecharunt ex #39Double Rare $9.00 Pecharunt ex - 085/064 #85Ultra Rare $6.99 Pecharunt ex - 092/064 #92Ultra Rare $6.48 Pecharunt ex - 039/064 #39Double Rare $4.70 Pecharunt ex - 219/187 #219Special Art Rare $4.63
Slugma can be obtained from Wisdom of Sea and Sky: Ho-Oh pack in the Wisdom of Sea and Sky set
Outside of that, generic typal support like +1/+1 counters or tribal buffs work fine since aliens are creatures like any otherbut if you're chasing true synergy, mechanics like paradox, suspend, and even exile interaction are where aliens really shine
