Falkenrath Forebear can give you a steady stream of Blood tokens throughout the game as long as you can deal combat damage with it each turn
Threshold Whenever you attack with one or more Rats, if there are seven or more cards in your graveyard, you may pay
(As you cast that spell, you may sacrifice a creature with power 2 or greater
In fact, Sazh's nameless chick is so cute he also gets his own creature card
Kozilek, the Great Distortion Again a colorless cost of 10, but this time 2 have to specifically be colorless
On top of all that, Arahbo passes the bear test. Its a 5/5 for 5 mana, and theres no reason its 2-color mana value would slow you down in a typical game of EDH