Garp with Jack is such a fun combo, the gecko plays generally feel bad in it unless you want to use gecko for Rebecca + reduction, then it's not as bad. My favorite 10 don play was gecko > Becca > brook 2k, add 2 more don to leader and Jack to KO a 7c and swing 7k with lead

Garp's ability doesn't say "once per turn", so can you use it multiple times? Or am I missing something