Slobad, Iron Goblin Burst mana generation is powerful, especially when you include expensive artifacts like Myr Enforcer and Sojourner's Companion
Mana Vault Mana Vault is part of a nasty 2-card combo: Mana Vault plus whatever busted 4- or 5-mana spell you want to play on turn 2 strong enough to be banned in Legacy and even restricted in Vintage
A wall of Pokmon plush carries Pikachu, Charmander, Squirtle, Bulbasaur, and Eevee variants
For four mana, you both get to draw a card and put a relevant body into play
The same is true for bonus clarity: the fewer hidden caveats, the better the first impression and the fairer the longterm experience for regulars
It's not exactly Tasigur or Fact or Fiction levels of demoralization, but you get the idea: they'll have no good choices and will be sad in-definitely