Redmane Festival

At the beginning of each players' upkeep all players surveil 4 and put a +1/+1 counter on each creature they control

At the beginning of your upkeep if Radahn has he greatest power among creatures on the battle sacrifice this enchantment, then destroy all other creatures except for Radahn, gain 1 life and draw a card for each counter on Radahn, then remove all counters from Radahn