Flavorfully, this is Ulamog after consuming all of Zendikar's mana. He's become so large, he's essentially a plane unto himself. If you feed him lands/mana, he'll fight for you.
Ulamog, the Living Plane
Legendary Land - (M)
~ is indestructible. t: Add 1 mana to your mana pool for every +1/+1 counter on ~ Landfall - Whenever a land enters the battlefield, you may sacrifice it and add a +1/+1 counter to ~. If ~ has 4 or more counters on it, you may have ~ become a 0/1 colorless Eldrazi creature with Annihilator 4.
Land (R)
~ enters the battlefield tapped. t: Add U to your mana pool.
Landfall - You may have ~ become a 1/1 creature with Hexproof and "Whenever this creature deals damage to a player, draw a card"
1
All creatures you control with no abilities except for deathtouch, hexproof, reach, or trample get +3/+3 until end of turn
1
Ulamog, the Living Plane
Legendary Land - (M)
~ is indestructible.
t: Add 1 mana to your mana pool for every +1/+1 counter on ~
Landfall - Whenever a land enters the battlefield, you may sacrifice it and add a +1/+1 counter to ~. If ~ has 4 or more counters on it, you may have ~ become a 0/1 colorless Eldrazi creature with Annihilator 4.
1
Land (R)
~ enters the battlefield tapped.
t: Add U to your mana pool.
Landfall - You may have ~ become a 1/1 creature with Hexproof and "Whenever this creature deals damage to a player, draw a card"