Considerations for those other two could be Dragonlord Dromoka to protect the combo, or Dragonlord Khologan to let everyone swing in for even more massive damage
Ill-Timed Explosion We are stupidly glutted for board wipes in Standard and theres not much Izzet action, but Ill-Timed Explosion is super powerful
Best land ramp (the most resilient ramp) Land ramp puts actual lands onto the battlefield, so it survives artifact removal and creature wipes, fixes your colors, and helps you keep hitting land drops
This looks great on things like Elsa and Auroras magic flourishes
Checks and Balances is yet another counterspell effect, but it's only in a game with three or more players and more than one player must basically agree to counterspell the third player's spell or whatnot
Starter Decks make for the best way to introduce players to the game or expansion, while boosters help to fill out a collection and offer a chance at pulling some rare cards