Magnus, Aegis King

When Magnus, Aegis King enters the battlefield, it gains 20 time counters

At the beginning of your upkeep, give
Magnus, Aegis King a +1/+1 counter if he has
11 or more time counters. If he has 10 or less
give him -1/-1 at the end of your end step

Bolster 1 at the start of each player's combat phase