Engineer

{1}{u}: Create a 1/1 blue sentry token artifact
creature with "{u}{u}, sacrifice this creature:
Create a 4/4 level 2 sentry token with
"{2}{u}{u}, sacrifice this creature: create a 8/8 level
3 sentry token""
{3}{w}{u}: Create a white artifact token with "
at the start of each upkeep, choose 2 creatures.
They gain indestructible until end of turn."
{w}{u}: cards in your hand gain flash until
end of turn.