Insects, Leeches, Slugs and Worms (with an O not a U) all trigger the life drain ability, so you could build this as a kindred typal deck, giving it some flexibility
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To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of this ability)
Yshtola, Nights Blessed On the surface, Yshtola, Nights Blessed seems like a simple but efficient card
If you control four or more lands, the basic land doesn't enter untapped
It's handy for combo strategies, builds your Storm count, pumps Prowess creatures, puts an Instant into the graveyard to get you towards Delirium or enlarge a Tarmogoyf, and gets you closer to Threshold or pays for Delve costs And sometimes you would rather have cards on top of your deck than in your hand