Kitsa, Otterball Elite + Ashnod's Altar + Intruder Alarm + Write into Being

Kitsa, Otterball Elite

Ashnod's Altar

Intruder Alarm

Write into Being

How it works

1. Cast Write into Being by paying its mana cost.
2. Kitsa's prowess ability triggers, giving it +1/+1 until end of turn.
3. Holding priority, activate Kitsa's second ability by paying 2 and tapping it, copying Write into Being.
4. Resolve the copy of Write into Being, causing you to put a card from your library onto the battlefield face-down as a 2/2 creature.
5. When the creature enters, Intruder Alarm triggers, untapping all creatures.
6. Holding priority, activate Ashnod's Altar by sacrificing the face-down creature, adding CC.
7. Repeat from step 3