Tyanna, Kenson's Heir

Indestructible, Hexproof
Whenever Tyanna, Kenson's Heir enters the battlefield, reveal the top 4 cards from your library, place any number of islands onto the battlefield, the rest goes to your hand
When Tyanna, Kenson's Heir attacks, create a 2/2 blue merfolk creature token with vigilance, then exile that token at the end of your next turn
If Tyanna, Kenson's Heir becomes blocked by a non-blue creature, Tyanna, Kenson's Heir gains meance till end of attack stage