Brass Infiniscope + Voltaic Construct + Karn, Silver Golem

Brass Infiniscope

Voltaic Construct

Karn, Silver Golem

How it works

1. Animate Brass Infiniscope.
2. Activate Brass Infiniscope by tapping it, adding CC and creating a delayed triggered ability.
3. Activate Voltaic Construct by paying 2, untapping Brass Infiniscope.
4. Repeat steps 2 and 3 as desired.
5. Cast the spell with X in its mana cost, with X being at least 2 if you wish to gain life.
6. Each instance of Brass Infiniscope's delayed triggered ability triggers, causing you to draw a card and gain half X life, rounded down, for each trigger.