Okay

[Loafing Giant]

Monkey Mad House
5GGG
Instant
Destroy Creature with the highest coverted mana cost it can't be regenerated. put 3/3 ape tokens with tap 1G
regenerate equal to that creature's coverted mana cost

Heee,Heee

 

[Chaos Turtle]

Monkey Mad House
5GGG
Instant

Destroy target creature with the hightest converted mana cost. It can't be regenerated. Put X 3/3 green Ape creature tokens into play, where X is that creature's converted mana cost. These creatures have "1G, Tap: Regenerate this creature."

...

Out of flavor for green.
The Apes are too big.
The regenerate cost should not include "Tap."
Card name is not appropriate for an instant.

...

Simian Assault
4WG
Sorcery

Destroy target creature with the highest power. It can't be regenerated. Put X 1/1 green Ape creature tokens into play, where X is that creature's converted mana cost. These creatures have "1G: Regenerate this creature."

...

And it's still probably a little too strong.