Cheapest priced copy (Core Set 2021): $0.49 at Card Kingdom, near mint, their price list as of .
Basri's Aegis 
Sorcery · Rare · Core Set 2021 · #322
Put a +1/+1 counter on each of up to two target creatures. You may search your library and/or graveyard for a card named Basri, Devoted Paladin, reveal it, and put it into your hand. If you search your library this way, shuffle.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2021 | 322 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 23 June 2020You can cast Basri's Aegis without any target creatures. You'll just search for Basri, Devoted Paladin.
- 23 June 2020If do you choose targets and each target creature is an illegal target by the time Basri's Aegis tries to resolve, the spell won't resolve. You won't search for Basri. If just one target is still legal, however, you do put a +1/+1 counter on it and search for Basri.