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When this card destroys a monster by battle: You can Special Summon 1 Level 5 or higher monster from your hand or GY in Defense Position, except "Odd-Eyes Advance Dragon"

Koraidon ex has the following abilities: Legendary Drive: Once during your turn, when you play this Pokmon from your hand onto your Bench, you may switch it with your Active Pokmon

The entire list of cards is available below, the main deck has 42 cards

In addition to his fight ability, he makes all other hydra creatures 4 mana cheaper, so the turn you cast him (and the turn after) you will be able to flood the battlefield with enormous hydras

Card Type / HP / Stage: Grass / 60 / Basic

This also goes for spells like Pyroclasm which deal damage to each creature instead of targeting anything specific