As previously mentioned, mono-blue and mono-red have virtually zero cards which gain life (in the case of red, actually zero)
Jumpstart boosters each contain 20 cards, so you simply tear open two packs, shuffle the cards together and, hey presto, you've created a Jumpstart deck
Lord of the Forsaken from Midnight Hunt was a spicy potential include for Chainer, but a little on the pricier side a few years ago
Notably though, some of the most interesting cards are monocolored
2.Return From A Different Dimension This card is similar to previous entries on this list
By then, gaining life was acknowledged to be a pretty meh effect, and the notion of exchanging life for resources was really starting to take off