This is because Leech Life doesnt have a base set of HP that it heals, but rather it heals per damage
When it comes to the latter, there's no better board wipe for a Demon-tribal deck than Kindred Dominance
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Tale of Toph and Katara Tale of Katara and Toph is an incredibly efficient counter distributor because its distribution is nearly free
Each other creature you control enters with an additional +1/+1 counter on it
Talk about a major letdown