Goad effects like Taunt from the Rampart and Disrupt Decorum are the bluntest tools here, but you can also use Gix, Yawgmoth Praetor, Scriv, the Obligator, and Edric, Spymaster of Trest to reward your opponents getting into the red zone
Alternatively, Trostani, Selesnya's Voice will gain a lot of life off of those big-butted wurms youll be dropping
Red is the color you should use if youre looking to pack your deck full of dragons
You can pay the cost of "discard your hand" even if your hand contains zero cards
Now, once you play your Giant Growth (and target your goblin), it will get the +3/+3 boost, becoming a 5/5 until the end of the turn, and no longer die to Defeat because its power is now over two