Ice Age was the first set to have cantrips, cards with small effects that replace themselves with a single drawn card
So what is poison, and how does it work

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We were able to beat Living End by stealing our opponent's Force of Negations to counter Living End itself, and against Carth Friends, we managed to snag the combo of Carth the Lion and Kaya, Orzhov Usurper to repeatedly answer the 9/9 our opponent was getting for free each turn thanks to a Kiora emblem
If so then Reveillark is great but if not then it is fairly unexciting
Sure, it is an OK incidental or ongoing effect and works fine as a combo kill card but it lacks all the middle bit where you get to push ahead and develop a position as Feeder allows for