Paying six mana to give all of your creatures what is essentially double lifelink and flying is a way to either end a game on the spot, or make it nigh impossible for your opponents to outrace you
5: The Earth Crystal (and the cycle) Im highlighting The Earth Crystal, but the whole cycle deserves a look
(It's an artifact with " , , Sacrifice this token: You gain 3 life.") Ball Lightning Rarity: Rare TYPE: Creature SUBTYPE: Elemental CMC: 3 Mana cost: USD: $0.20 EUR: 0.35 TIX: 0.02 EDHREC RANK: 8904 (6/1) Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) Haste (This creature can attack and as soon as it comes under your control.) At the beginning of the end step, sacrifice this creature
If youre in artifacts, youre playing Imposter Mech, but probably taking Phyrexian Metamorph before it
Alongside some strong removal (two good fight spells, and a good common exiling in Shoot Down), it makes Green a solid color in the format