Goat format ruling
The Agent of Wisdom - Mercury

Card effect (current official text)During your Standby Phase, if you controlled this face-up card and had no cards in your hand at the end of the opponent's last End Phase: Draw 1 card.
Rulings
- If your hand was increased during the End Phase by activating Jar of Greed, and you have a card in your hand at the end of the End Phase, then The Agent of Wisdom - Mercury's effect does not activate.
- If your SP is skipped then The Agent of Wisdom - Mercury's effect disappears.
- If you have multiple The Agent of Wisdom - Mercury you can draw multiple times.
- When you have The Agent of Wisdom - Mercury on your side of the field and you have no cards in your hand at the end of your opponent's End Phase, but it is destroyed before your SP (such as with Ring of Destruction during your DP), then you do NOT draw during your SP because The Agent of Wisdom - Mercury is no longer on the field.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.