Kitten, Never To Be Defeated

Indestructible
When Kitten enters the battlefield you gain 5 life,
if you controll 4 or more ''Joke'' cards, you gain
10 life instead.
{c}{c}, {t}: Tap all ''Serious'' creatures.
{9}{c}{c}{c}{c}{c}: If you control ten or more ''Joke'' creatures, you win the game.