Well only discuss cards that have the text gain life. Lifegain is an effect primarily seen on white cards, with black cards and green cards coming in a close second and third
she doesn't even need to be the one to declare an attack, which means you can get immediate value off this card the turn it hits play
What Happens If You Discover a Counterspell
0.3 mm Finish : Smooth, water-resistant Feel : Durable, flexible Best For : Outdoor decks, food-safe cards, spill-prone environments This non-paper card stock is fully waterproof, tear-resistant, and designed to last
Of course, the flipside is you could pay 3 life and get a mountain out of Mystic Peak
You give yourself some powerful late game options as well as potential infinite turns courtesy of Time Sieve