Goblin Biker Grand Bash (Ultra Rare)

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.