Combo focused on lots of card draw + self buff.
4x Season of Growth (1G, enchantment, draw when you target allied creature with a spell)
4x Gnarlback Rhino (2GG, 4/4 trample, draw a card when you target with a spell)
4x Incubation Druid (1G, tap for 1, tap for 3 if upgraded)
4x Stony Strength (G, instant, add +1/+1 and untap)
+ about 20x cheap self-targetting cards
+ about 5x early board and search
Buff a Rhino with your entire deck. The Rhino charges. You win.
Usually you get one small combo (4-5 cards played, 10 cards drawn) which helps build your engine. Then next turn you can play 12+ cards and win.
Extreme amounts of draw, plus druid mana, plus cheap cards (everything <2 CMC except Rhinos) means that you can safely run 18-19 lands. This helps prevent combos from fizzling.
Stony Strength untaps Incubation Druid (and "adapts" it). This lets you extend combos. If you have a druid in play, each Stony Strength drawn gives net +2 mana and draws extra cards off of Season of Growth.
(question marks indicate cards I have not yet tried)
Giant Growth (G, +3/+3)
Might of the Masses? (G, +1/+1 for each creature you control)
Steady Aim (1G, +1/+4 reach, untap) (druid mana)
Growth Cycle (1G, +3/+3 plus an additional +2/+2 per use) (you always play 3-4)
Gift of Strength (1G, +3/+3 and reach)
Titanic Growth? (1G, +4/+4)
Prey Upon? (G, fight target)
Rabid Bite (1G, deal power to creature)
Kenrith's Transformation? (1G, turn into 3/3 elk, either self-target or removal)
Silhana Wayfinder (1G, 2/1, scry top 4 cards for land/creature)
Bond of Flourishing? (1G, search top 3 to draw permanent, gain 3 life)
Once Upon a Time? (1G, search top 5 to draw land/creature)
Voracious Hydra (XGG, X/X+1, on ETB either double strength or fight creature)
druid + stony silence -> 8/9 trample on turn three
Loaming Shaman? (1G, a one-of so you don't deck yourself trying to win)
White has many combat tricks. Lifelink is nice when consistently buffing creatures to 10+ attack. Flight + Glaring Aegis + Princess lets you hit face consistently at combo end.
Arrester's Zeal? (W, +2/+2, addendum:flying)
Defiant Strike? (W, +1/+0, draw a card)
Gird for Battle? (W, two +1/+1 counters) (upgrades druid)
Glaring Aegis (W, +1/+3 forever, ETB tap target)
Gods Willing? (W, protection from _color_, draw a card)
Take Heart (W, +2/+2, 1 life for each attacking creature)
Shepard of the Flock? (W, return ally to hand) + creature
Faerie Guidemother (1W, +2/+1 flying) + creature
Angelic Gift (1W, enchant flying, draw a card)
Battlefield Promotion? (1W, +1/+1 token, first strike, 2 life) (upgrades druid)
Moment of Heroism? (1W, +2/+2 lifelink)
Silverflame Squire (2W, +2/+2 untap) + creature (0 mana card draw on adapted shaman)
Beloved Princess (W, 1/1 lifelink) (good to buff and swing, better than hawk)
Faerie Guidemother (1W, 1/1 flier)
Shepard of the Flock? (1W, 3/1)
Silverflame Squire (1W, 2/1)
Rally of Wings? (1W, untap ALL creatures) (druid mana)