It costs six and has an on curve 6/5 body with two evasions in flying and trample - hard to stop
What to Cut First Speed, Young Avenger Low power and toughness with marginal counter synergy
And it also protects our precious enchantments
Rest in Peace, Containment Priest, Relic of Progenitus, Nihil Spellbomb, and their ilk will shut you down hard, so keeping at least 1 piece of spot removal for these on hand should be a priority
The Angel then gains, You cant lose the game, and your opponents cant win the game. Now, you cant do this at instant speed, but its still a very potent effect, and being able to put this on whichever Angel you choose makes it an essential card for any Angel deck
I guess this represents a disease that the mosquito spreads to you