If a creature is about to die to something unrelated to Vampiric Dragon, then go ahead and spend two mana to put your mark on the creature, and then when it dies, you'll get a +1/+1 counter
Elvish Warmaster is a fantastic inclusion for pretty much any elf deck due to going wide and providing an outlet for all that mana produced by Circle of Dreams Druid and whatnot
That means the higher end stuff can get tossed out a lot, and you want to make sure you have everything from the hilarious Scornful Egotist to powerful Green tramplers
Combine this with goblin tokens and a card like Rundvelt Hordemaster, and you can cast a good chunk of your deck
Plus, it doesn't remove itself from the game so you can get it back with Regrowth, Yawgmoth's Will, and other graveyard recursion cards (including Gaea's Blessing, further down on this list)
Tetsuko Umezawa, Fugitive Tetsuko Umezawa, Fugitive is a sneaky one without any way to deal out the poisonous stuff on its own