Nekrozma, Champion Of Fear

When Nekrozma, Champion Of Fear enters the battlefield target opponent reveals their hand and discard two cards of your choice.
If Nekrozma would be sent into a graveyard or
exile by an opponent or is sacrificed, reveal
it and shuffle it back into its owners library.
- If you control four different color dragon
champions put Zerta, Last Breath from
outside the game onto the battlefield.