The best ones to do that are artifacts, so any drafter can use them, but some colored ones look interesting as well: And to help with critical mass, there are some Changelings and clones that are commonly used anyway: Ideally, the effect I want to achieve is: - 1-2 decks per pod have minor tribal themes (say, RG Beatdown with Krenko, Mob Boss, Siege-Gang Commander and Goblin Warchief doing cute things) - In about 50% of the drafts, a dedicated tribal deck is drafted, running the generic tribe enablers (White weenie running mostly Soldiers with Adaptive Automaton, Harsh Mercy, Mutavaultand Obelisk of Urd) - Once in a blue moon, someone puts together Shriekmaw, Mulldrifter, Flickerwisp, some clones, changelings and the tribal cards and makes a crazy 4-color Elementals blink deck that's bad but loads of fun

6 Avabruck Caretaker - $17.99 Easily one of the strongest werewolf cards in recent memory, Avabruck Caretaker is a six-mana 4/4 with hexproof and daybound, putting two +1/+1 counters on a creature under its owner's control each turn
Id rather put out an enabler (an evasive one-drop) and hold up mana for a counter, or spend my turn on a tutor or cheaper Ninja
what drives these prices is provenance, authenticity, and grading from PSA, BGS, or CGC
The gold-plated Charizard, Pikachu, Mewtwo, and others that came in a Pok Ball case for $1.99
Time Out This silver-bordered card is an essential card for bouncing effects