Elemental Appeal

The kicker ability doesn't let you pay a kicker cost more than once.

To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.

If Elemental Appeal was kicked, it creates a 7/1 token with trample and haste that gets +7/+0 until end of turn. It doesn't create a 14/1 token. This matters in case something copies that token (the copy will be just 7/1), or in case Elemental Appeal is somehow cast during an end step (in which case the +7/+0 lasts just for that turn).