Rin and Seri, Inseparable // Rin and Seri, Inseparable Finish:Nonfoil if it's the first instant

if it's the first instant spell

Each Magic: The Gathering - Secrets of Strixhaven Lifegain Theme Deck contains:

Trample Whenever Ilharg attacks

Whenever Black Widow deals combat damage to a player

Rin and Seri, Inseparable // Rin and Seri, Inseparable Finish:Nonfoil if it's the first instantRin and Seri, Inseparable Whenever you cast a Dog spell, create a 1 1 green Cat creature token. Whenever you cast a Cat spell, create a 1 1 white Dog creature token. {R}{G}{W}, {T}: Rin and Seri deals damage to any target equal to the number of Dogs you control. You gain life equal to the number of Cats you control. Rin and Seri, Inseparable Whenever you cast a Dog spell, create a 1 1 green Cat creature token. Whenever you cast a Cat spell, create a 1