Kiora's Leviathan

Trample, islandwalk, protection from blue, protection from green
This spell costs {1} less for each island you control
Whenever Kiora's Leviathan attacks, the
defending player must block it with all creatures
he/she controls if able
"Now Thassa, you shall see what a true Goddess of
the Sea should be like!"
- Kiora to Thassa