Full combo is any hand with: a level 4 beast-warrior monster, any way of getting to Kerass (of the 12 I'm running), and a fire formation spell (that includes the field spell)
Summon Eagle with the effect of Kerass, Eagle bounces your Fire Formation to send Buffalo, normal any level 4 beast-warrior then summon tiger king, link with kerass for whatever you want
Extra Deck needs work, you can remove Zoodiacs for Bear, more space but you don't have Drident pop for next turn but maybe you could abuse Saryuja