Still, for a long time it was a difficult card to find
Robber of the Rich One of the most annoying cards that I had to face when I started playing Magic again after a long break was Robber of the Rich
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
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Illustrated by Dave Kendall Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
The win condition aspect is a little clunky, but the ability to trade two mana for a card carries this artifact and proves its importance in creature-based white decks
The Sword does give your creature +3/+2 (ensuring your Birds of ParadiseBirds of Paradise can still cast a Beast WithinBeast Within off a single hit) but no evasion