Anything with {deadeye navigator}. Like {evangel of heliod} or {abhorrent overlord} to get mobs of creatures
{dual nature} makes an excellent companion enchantment, along with {parallel lives}, so each time one creature returns, you will have a copy from the lives.
And just to clarify a bit, yes the copy from the nature will vanish with the original, but the one created by the lives stays put...
{stonehorn dignitary} is stupid good with flicker XD
A few found that works with the navigator...
For those pesky mass 1/1 critter decks...
{thundermaw hellkite} or {bogardan hellkite}
For creating critters
{myr battlesphere} or {precursor golem}
If you also want to use the critters it produces to make it big...
{pentavus}, especially with a {doubling season} in play
For land control,
{sundering Titan} if you use no basic land, or {avalanche riders}
(Very effective if you also have a {dual nature} and {doubling season} or {parallel lives} in play)
I believe {Sundering Titan} is banned.
{Sylvan Primordial}.............. Crap, never mind, wizards caught on.
{Rune-Scarred Demon} and {Conjurer's Closet} are made of good times. Free tutor every turn? Yes please!