Cards like Grim Giganotosaurus and Hunting Velociraptor offer powerful abilities and alternate casting costs for Dinosaur-themed decks
Alternatively, you can use an effect like Birthing Ritual to sacrifice it for added value
Norman Osborn / Green Goblin Cut card: Damocles Base, Sword of Kang Norman Osborn from the Spider-Man set is a perfect fit, giving us an unblockable conniver who later on lets us cast cards from our graveyard for cheap as we discard them
Ulamog, the Defiler Ulamog, the Defiler has the biggest possible value of annihilator yet, and all you need to do is to get some +1/+1 counters on it
But I do love drawing cards and proliferating
My ranting on bugs was my ignorance of the rules, as +1/+1 counters and -1/-1 do not negate each other until after the check on whether a creature is put into the graveyard as part of the state-based effect for having zero or less toughness