Infernal Pet

Name: Infernal Pet
Brand: Magic: The Gathering
Price: 0.12 USD

Whenever you cast your second spell each turn, put a +1/+1 counter on this creature and it gains flying until end of turn.

Infernal Pet has 1 printing, first in Kaldheim (2021). EDHREC ranks it #26,402 among Commander cards. It has 2 official rulings.

Legality

Cards that show up in the same decks on EDHREC.

2021-02-05: The triggered ability triggers only if the creature that has it is on the battlefield as you cast your second spell. Spells you cast in a turn before that creature entered the battlefield will count. In other words, the ability won’t trigger if the creature with the ability is the second spell you cast during a turn or if you have already cast two or more spells by the time that creature enters the battlefield that turn.
2021-02-05: The triggered ability can trigger only once each turn. The ability will resolve before the second spell does. It doesn’t matter if the first spell you cast that turn has resolved, was countered, or is still on the stack.