In Legacy and Modern we see an abundance of U/R combo decks, and the Modern decks might even be interested in playing Temple of Epiphany
They ramp hard, build momentum fast, and win through multiple lines
Most of these creatures are mana dorks or cost reducers to help us actually play our expensive wurms, while a couple fulfill some utility roles we cant use wurms for
The big risk is that if the thing its attached to dies, the Aura goes to the graveyard too
For example, something as simple as Boromir, Warden of the Tower goes infinite with Ratadrabik, as you can sacrifice Boromir to his ability, creating a 2/2 non-Legendary Boromir, tempting that Boromir, and then repeating this cycle until you have drained out the table with any Blood Artist effect