With Nadu and Nantuko, every land drop makes more creatures, more creatures means more Nadu triggers, and more Nadu triggers means more land drops
Whenever one or more +1/+1 counters are put on a creature you control, put that many growth counters on this enchantment
The specific rules to know: deck size is exactly 50, EN cards only, sideboard is optional but up to 15, and game losses are assessed for slow play in timed rounds
Red XIII, Proud Warrior Toss those +1/+1 counters on your creatures and go on the offensive with nearly board-wide trample, and the vigilance to not lose any ground
Either way, this is a phenomenal way to punish an opponent for attacking you, and should be respected
Lets just jump in and take a peek at the original list