Helen, Instigator of War

Defender
When Helen, Instigator of War enters the battlefield, put a +1/+1 counter on each Trojan Soldier you control.
At the beginning of your upkeep, flip a coin. If you flip a heads, put a +1/+1 counter a Trojan Soldier you control. If you flip a tails, put a +1/+1 counter on each Spartan Warrior.