Goblin Biker Grand Bash

"Goblin" monsters you control gain 300 ATK for each "Goblin" monster you control. During your Main Phase, you can Normal Summon 1 "Goblin" monster, in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) You can target 2 "Goblin" monsters you control, then activate 1 of these effects;• Make the Level of 1 of the monsters become the current Level of the other.• Both of their Levels become their combined original Levels.You can only use this effect of "Goblin Biker Grand Bash" once per turn.