CardName: Polis Sentinel
Cost: 3
Type: Artifact Creature - Construct
Pow/Tgh: 0/3
Rules Text: Defender
Whenever Polis Sentinel blocks a creature, you may pay {3}.
If you do, draw a card.
Flavour Text: The Temples to Ephara have been rather quiet recently...
Set/Rarity: Theros Rekindled Common
Polis Sentinel
C
Artifact Creature – Construct
Defender
Whenever Polis Sentinel blocks a creature, you may pay . If you do, draw a card.
The Temples to Ephara have been rather quiet recently...
Nice. Repeatable card draw is uncommon though.
If you made this block-based AND one-off it could work, still have to cost though.