The cost to cheat a potentially expensive creature right into play costs just six mana (three and a 'naya')
(5/29/2014) When you use Deal Broker's second ability, after you reveal your card, each other player chooses up to one card from their card pool, then all those chosen cards are revealed simultaneously
Mardu Roughrider, Mardu Heart-Piercer, and Bellowing Saddlebrute are the only nonrare creatures in red, white, or black I could consider taking over lands or removal spells
When you reveal a creature card this way, put X +1/+1 counters on target creature you control, where X is the mana value of that card
OP07-119-portgasdace is another option if we need an immediate attacker to close out the game or attack a Rested Character