Niv-Mizzet, Dracogenius plus Niv-Mizzet, the Firemind is already an absurdly good combo if you manage to play both of them
Mana Ramp Twists and Turns is one of my favorite new green spells for creature-heavy decks
Keep in mind the effect of the Paracide will activate during the turn end phase so don't use it with the stun cards or you'll waste the effect
Elemental Bond + Tribute to the World Tree Elemental Bond versus Garruk's Uprising sparks an interesting discussion, but I favor Elemental Bond as it has a lower threshold for that juicy card draw
Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.) After the first ability has resolved targeting a creature, that creature has lifelink and can't be blocked for the rest of the turn, even if its power increases to 3 or greater
Transfer its materials to the Summoned monster.) During your Draw Phase, if this card is in your GY, instead of conducting your normal draw: You can add this card from your GY to your hand