{Deadeye Navigator} + {Crystalline Crawler} + {Master Biomancer}
Innately gives you an infinite flicker loop (remove counters from crawler, flicker it, re enters with 2 counters, repeat.)
With a bigger {Master Biomancer} gives you infinite mana and infinite enter the battlefield effects.
Throw in {Cathars' Crusade} to make your creatures infinitely big and get infinite mana without a bigger {Master Biomancer}.
Needless to say this is going in my {Atraxa, Praetors' Voice} deck.
Something else you could do is replace {Master Biomancer} with {Deepglow Skate}, so long as {Crystalline Crawler} is on 5 counters, choosing {Deepglow Skate} for {Deadeye Navigator}. Remove two counters from crawler, flicker skate, double counters on crawler, repeat as many times as wanted.