Abzan's Challenge

Start with this card in the challenge zone. At beginning of your upkeep put an age counter on it an roll a dice:
1/2 - Put 2 2/2 creature into the challenge zone
3/4 - Creatures with +1/+! counters in challenge zone gains vigilance and +x/+x until end of turn, being X the number of age counters on Abzan's challenge
4/6 - Put a +1/+1 counter on each creature in the challenge zone