To help smooth out the three colors a bit better, Im also adding Fellwar StoneFellwar Stone and Exotic OrchardExotic Orchard
This isn't a straightforward question to answer, as everyone's reason for buying such an expensive product will be different
Want to destroy enchantments (Aven Cloudchaser), draw cards (Benalish Heralds), exile creatures (Catapult Master), prevent damage (Combat Medic), gain life (Conclave Phalanx), prevent all combat damage (Dream Fighter, Frontline Strategist), deal damage (Goblin Legionnaire, Rockcaster Platoon), bounce a creature (Sun Ce, Young Conqueror), or destroy a land (Keldon Arsonist)
Flying, trample.Humans you control get +1/+1.Coven Whenever Sigarda attacks, if you control three or more creatures with different powers, look at the top five cards of your library