Toolcraft Exemplar

Oracle Text

At the beginning of combat on your turn, if you control an artifact, Toolcraft Exemplar gets +2/+1 until end of turn. If you control three or more artifacts, it also gains first strike until end of turn.

Card Rulings

9/20/2016 If you control no artifacts as your combat phase begins, Toolcraft Exemplar’s triggered ability doesn’t trigger at all. If you control no artifacts as the triggered ability resolves, it has no effect.
9/20/2016 Whether or not you control three or more artifacts is checked only as the triggered ability resolves.

Additional Information