Annie, Arcane Engineer

Ward — Tap an untapped creature you control
Whenever you create one or more tokens, the
next instant or sorcery spell you cast this turn
costs {1} less for each token created.
At the beginning of combat on your turn, create
an X/X colorless Construct artifact creature
token, where X is the number of instant and/or
sorceries you have cast this turn. It gains haste.