Arcane Signet is also a no-brainer, but it is occasionally absent from Commander precons
Creature - Dryad Tokens (CTRL to add secondary) Maybeboard Sidequest: Raise a Chocobo When this enchantment enters, create a 2/2 green Bird creature token with "Whenever a land you control enters, this token gets +1/+0 until end of turn." At the beginning of your first main phase, if you control four or more Birds, transform this enchantment
That said, Id resist the temptation to stick some of the zero-drop artifact creatures like Ornithopter in
The card was only available to those who spent a certain amount of money at specific Pokmon Centers in Japan
Storm-Kiln Artist A key card in a spellslinger and/or Treasures deck, Storm-Kiln Artist is a must-include in a number of decks, including just about everything in Izzet and just about every deck that runs Krark, the Thumbless as one of its commanders