Cheapest priced copy (March of the Machine): $0.69 at Card Kingdom, near mint, their price list as of .
Errant and Giada 
Legendary Creature — Human Angel · 2/3 · Rare · March of the Machine · #306
Flash
Flying
You may look at the top card of your library any time.
You may cast spells with flash or flying from the top of your library.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.69 to $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 224 | Rare | $0.69 | $0.79 |
| March of the Machine | 306 | Rare | $0.99 | $1.49 |
| March of the Machine Promos | 224p | Rare | $0.99Out of stock | $0.79 |
| March of the Machine Promos | 224s | Rare | — | $1.79 |
2 rulings from Wizards of the Coast
- 14 April 2023Errant and Giada lets you look at the top card of your library whenever you want (with one restriction—see below), even if you don’t have priority. This action doesn’t use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.
- 14 April 2023If the top card of your library changes while you’re casting a spell, playing a land, or activating an ability, you can’t look at the new top card until you finish doing so. This means that if you cast the top card of your library, you can’t look at the next one until you’re done paying for that spell.