Forgiveness Day

Creatures with power and thoughness 1/1 get
+2/+2.
Whenever a 1/1 creature enters the battlefield
flip a coin. If you win the creature enters the battlefield under your control, otherwise it enters
the battlefield under target oponent control.
"They ate at the same place, then they became enemies.
The day of forgiveness was at bay and friendship flourished once more"
- The Velhotes Chronicles, Book 2, Passage 3.