Wrenn and Six is the backbone of the 4-color decks that define the format at the moment and grants these decks a level of consistency that is unparalleled
Tezzeret the Seeker I remember Tezzeret the Seeker being a much more ubiquitous card than it is now, but I dont think its ever stopped being good
This ability will only trigger if a creature hits an opponent, not you, highly incentivizing your opponents to attack anyone else other than you to get those extra cards
The Throne is an equipment that can let me tap to give other creatures I control trample and +X/+X where X is the equipped creature's power
The second card that I am considering is Lunar Convocation, because that card is less expensive than is Greed, yet has several amazing abilities, but, again, its primary ability costs 1 more mana than does that of Greed, so I am not certain if I can justify replacing the existing enchantment