Credit: Wizards of the Coast Rodolf Duskbringer FromTheShire: He doesn't let you combo off, but Rodolf will do some powerful and annoying stuff, even if he's just in an aristocrats shell
The Insects can even spawn more of themselves with the help of effects like Reconnaissance Mission and Unctus, Grand Metatect
For example, take a White aggressive deck built around cheap creatures with tempo-disruption abilities attached like Thalia, Guardian of Thraben, Imposing Sovereign, Containment Priest, and Aven Mindcensor
This means all of blue's transformation abilities are auras or limited effects on spells or activations
Vow Cycle Lets put all these vows together, as they all work similarly
The attack/enters trigger provides a ton of value by dumping free dragons into play, and you can easily wring additional triggers via flicker effects and extra combats