Cheapest priced copy (Modern Horizons 2): $0.49 at Card Kingdom, near mint, their price list as of .
Moderation 
Enchantment · Rare · Modern Horizons 2 · #371
You can't cast more than one spell each turn.
Whenever you cast a spell, draw a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 206 | Rare | $0.49 | $0.49 |
| Modern Horizons 2 | 371 | Rare | $0.49 | $0.49 |
| Modern Horizons 2 Promos | 206s | Rare | — | $0.99 |
3 rulings from Wizards of the Coast
- 18 June 2021Moderation's triggered ability works only while it's on the battlefield, so it doesn't let you draw a card when you cast it.
- 18 June 2021If an effect says you can't cast spells, and another effect instructs you to cast a spell, such as that of the ability that triggers when you remove the last time counter from a card with suspend, you won't be able to cast that spell.
- 18 June 2021If you cast Moderation, you've already cast at least one spell that turn (Moderation itself) so you won't be able to cast any more spells until the next turn. If Moderation comes under your control on a turn you haven't cast any spells, you'll be able to cast one spell that turn.