Animar, Elements' Leader

Whenever a non-token elemental enters the battlefield under your control, you may pay {u}, {r}, or {g}. If you do, create -
• a 2/2 blue elemental token with flying if blue
mana was paid
• a 2/2 red elemental token with haste if red
mana was paid
• a 2/2 green elemental token with reach is green
mana was paid