Displacer Kitten + Guile + Sister of Silence

Displacer Kitten

Guile

Sister of Silence

How it works

1. Cast any instant or sorcery spell from your hand by paying its mana cost, or wait for an opponent to cast one.
2. In response, cast Sister of Silence by paying 4.
3. Sister of Silence enters the battlefield, exiling the spell and causing you to cast the spell from exile without paying its mana cost due to Guile.
4. Displacer Kitten triggers, blinking Sister of Silence.
5. Repeat from step 3.