If I reveal Undertitan using Void Hatchling and I have Candlelit Sanctum on the battlefield, then use Rek'Sai Legend, do I get extra energy (total of 6 energy)?

Ruling: You only get 2 energy from Rek'Sai Legend when revealing Undertitan. Void Hatchling and Candlelit Sanctum use "look" not "reveal", so they do not trigger Undertitan's energy gain effect.

Sequence:

• You conquer
• Proc Candlelit Sanctum, look at top two and decide if to recycle or not
• Proc Rek'Sai Legend, but this triggers Void Hatchling, so you look at the top card first, then decide if you recycle or not
• Then you reveal the top two cards and choose to play one with Rek'Sai Legend effect (this is when you get 2 energy from Undertitan)

Nuances:

• "Look" means only you see the card (private information)
• "Reveal" means you show the card to your opponent
• Only "reveal" triggers Undertitan's energy gain
• If you have multiple Void Hatchlings, they stack and you can look at the top card multiple times, but still won't gain energy since it's looking, not revealing