Its for a causal deck, so going "infinite" is something I tried to avoid. Right now my "combo" is Kraj, Viridian Joiner, Clockwork Dragon, and other fun stuff like Spinal Crusher (Remove a +1/+1 to make Kraj unblockable) and that sunburst guy who looks like a buzz saw which is remove a +1/+1 counter for +4/+4 until EOT.
Essentially, Its for multiplayer, where in our group infinte combo is prohibated... but 30+ mana per yeilding a creature who gains 10 p/t each players turn is apparently within our rules =P
Oh and ofcourse Arcbound Reclaimer + Eldrich Oracle for mad insane draw (powered by that

to any color mana converter, snake for sunburst)