It's not hard to get five creatures in a token-themed deck, and 9/7 flying, lifelink, indestructible, haste is a lot for any opponent to deal with
I like the rather silly concept of Storm Seeker, where an embedded metal sword is going to attract lightning
Start with simple spells and creatures and gently build your confidence up before introducing planeswalkers and more complex cards
Notable Cards Jacked Rabbit is a frequent flier in strong Cubes due to its versatility, Agate Instigator is one of Commanders strongest Impact Tremors effects, and Pollywog Prodigy offers plenty of card draw in a multiplayer format
Some good payoffs for playing a colorless deck are cards like All Is Dust or Ugin, the Spirit Dragons -X ability, which clear your opponents permanents from the board while allowing you to keep yours