First, activate Feldon's ability and make a token copy of Worldgorger Dragon
You can cast it, create a 1/1 token, and return it to your hand for zero mana, allowing for an arbitrarily large army of Saprolings in a single turn
Thats the kind of question great game design always asks, which leads us to unearth the unearth mechanic
Zombies were the worst of the bunch, as a blue-black zombies deck struggled to function when its blue zombies needed creature cards in the graveyard and black zombies centered around creature tokens
For example, if 3 is not stored on Goblin Girder Gang and you roll two 3s, the ability will trigger twice
If all of these conditions are true, you will instantly win the game when using this attack