Waiku, Lord of Pinion

Flying, prowess
Spells you cast cost {1} less to cast for each spell
cast before it this turn.
When Waiku, Lord of Pinion dies, exile it instead.
When you do, you get an emblem with "whenever
you cast a spell, each opponent creates X 1/1 red Saboteur tokens, where X is that spell's converted
mana cost. Saboteurs can't attack you or planeswalkers you control."