Alpha, The Puzzle

Haste, first strike, reach

Modular X (This enters the battlefield with X +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)
Fabricate 5 (When this creature enters, put five +1/+1 counter on it or create five 1/1 colorless Servo artifact creature token.)
Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)

{5}: Put a +1/+1 counter on Alpha The Puzzle.