Blex gives you just a static buff, while Blechs lifegain trigger can get out of hand when you swing with a wide board of tokens that gain life when they attack
Blasphemous Edict Blasphemous Edict is a strong sort of board wipe that control players and token players can weather just fine
Consider what cards you might include that are both mana efficient and grant late-game reach
5 PHOENIXIAN CLUSTER AMARYLLIS A level eight monster, Phoenixian Cluster Amaryllis is one of the harder monsters to get rid of
G'raha Tia, Scion Reborn G'raha Tia, Scion Reborn is a great lifegain payoff, and prowess trigger, because with plenty of life, you turn those spells into decent-sized creatures for no extra mana
Its easy to see why future cards that added +1/+1 counters when you gain life tend to be restricted to putting a counter on a single creature at a time