Level IV: Sunken Caves

Roll 1d10
1-3 - Do nothing
4 - Put a 4/4 token on the battlefield (+3)
5 - Sacrifice your best creature
6 - Destroy your best artifact or enchantment
7 - Exile your best creature
8 - Sacrifice two best creatures or take 4 damage
9 - Play a 2/4 token (+7) or roll an Encounter (-1)
10 - Roll on Spooky Chart (+0)
Roll under 7: Advance to Level V