Slime Rain

When this enchantment enters the battlefield, put X rain counters on it.
At the start of your upkeep, remove
a rain counter from this enchantment,
then roll a d20.

Conjure a:
1-7 | Green Slime onto the battlefield.
8-12 | Blue Slime onto the battlefield.
13-16 | Purple Slime onto the battlefield.
17-19 |Pinky onto the battlefield.
20 | King Slime onto the battlefield.