When Kidmodo gets destroyed, you can special summon Lava Dragon in face-up defense position. If you have another level 3 or lower Dragon-type monster in your hand, you can tribute Lava dragon on your turn to special summon 2 monsters.
Tributes itself for cost
Special Summons from your hand / Special Summons from your Graveyard
You can get this with a R Ticket, should be added on the How to get
I get going for completeness and all, but... Why waste a R Ticket on something you can just beat Mokuba for? Mokuba's one of the easier characters to grind anyway.
My suggestion for this combo
Special summon It by kidmodo's effect in DEF position. Tribute It then special summon 2 RE Black chicks then activate it's effect then special summon REBD and normal summon 1 Level 4 or lower monster