The Nexus

As long as The Nexus remains on the battlefield, you cannot lose the game.

Whenever a creature an opponent controls dies, put a gold counter on The Nexus. Spells you cast cost {1} less to cast for every 3 gold counters on The Nexus.
Whenever a creature you control dies, put a experience counter on The Nexus. You may spend 1 experience counter to bring target creature with power 3 or less from your graveyard to the battlefield. You may spend 2 experience counters to bring target creature with power 4 o