Tarmogoyf, from Future Sight, is a green creature whose power and toughness grow with the number of card types in all graveyards, which routinely made it a 4/5 or bigger for two mana
Command BeaconCommand Beacon frees us from the burden of commander tax one time if we sacrifice it, Lightning GreavesLightning Greaves can boot Sauron up the turn he comes out (no extra mana needed), and Cavern of SoulsCavern of Souls prevents him from getting countered
Snapcaster Mage also enables you to sneak out unexpected counterspells, or flash a blocker onto an empty board and then buff it with a combat trick to destroy an attacker
So, how are you going to win off of this
Now, in a world of MDFCs, my deck-building technique has changed greatly
It really depends on what youre looking to do with your deck, but its very likely that at least one of these swords meets your needs for any strategy