There are five in total, one for each color
Defensive cards like Propaganda, Ghostly Prison, and Shabraz, the Skyshark can discourage opponents from attacking you
This strategy can also be applied when killing minions with genesis on The Geistwood
It's most popularly included in the 99 of faerie typal decks as it's easiest to generate more tokens via attacking with flying creatures
Kefka, Court Mage #543 Borderless Surge Foil Final Fantasy Change Version Kefka, Court Mage Legendary Creature Human Wizard Whenever Kefka enters or attacks, each player discards a card
Couple those cards with creatures like Mulldrifter, Reclamation Sage, or Craterhoof Behemoth, and you have an efficient deck with creatures that impact the battlefield immediately