Dewdrop Cure White has a lot of these effects, but trading a card to get a third creature back to play seems solid
For example, Chatterfang, Squirrel General sacrifices Squirrel tokens to help you remove opponents' creatures
First, they boosted the power and toughness bonus it granted, then dropped the cost to only one mana to cast and equip, and finally made it so it gave the creature 1 toughness, and it ended up being that fateful 1 that made Skullclamp into a monster, since all you had to do was play one-toughness creatures and you suddenly had a repeatable, colorless, one-mana Divination
(I was briefly running Haunted CloakHaunted Cloak before I realized that Ragnaraok already has all three keywords that the Cloak grants.) We'll take some flying from Cliffhaven KitesailCliffhaven Kitesail, some double strike from Brass KnucklesBrass Knuckles, and some shroud from Whispersilk CloakWhispersilk Cloak