Universal Embrace

All Spells Have Assist.
Each time an opponent pays mana to assist
put a +1 +1 counter on Universal Embrace
equal to the amount of mana spent this way.
At the beginning of each opponents turn remove
half of the +1 +1 counters on Universal Embrace.
All Spells cost {1} less to cast for each +1 +1
counter on Universal Embrace