How about a 150% payout on your winning multibet?

We will pay you up to 50% extra in cash on your winning multibet.

The payout is as follows:

5 games -> 10%
6 games -> 10%
7 games -> 15%
8 games -> 20%
9 games -> 25%
10 games -> 30%
10+ games -> 50%
Rules

All games selected must have a minimum amount of 1.5 (1.5 Odds per Game/match selection).
Bonus Starts from a multibet of 5 or more games.
The Multibet must be a winning multibet to receive the bonus
Only available on Online betting.