Cheapest priced copy (The Lost Caverns of Ixalan Commander): $5.49 at Card Kingdom, near mint, their price list as of .
Shared Animosity 
Enchantment · Rare · Commander 2020 · #158
Whenever a creature you control attacks, it gets +1/+0 until end of turn for each other attacking creature that shares a creature type with it.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $5.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 158 | Rare | $5.99 | — |
| Explorers of Ixalan | 29 | Rare | $7.49 | — |
| The Lost Caverns of Ixalan Commander | 231 | Rare | $5.49 | — |
| Tales of Middle-earth Commander | 226 | Rare | $6.49 | — |
| Morningtide | 104 | Rare | $7.99 | $37.99 |
| Star Trek Commander | 454 | Rare | — | — |
| Wilds of Eldraine: Enchanting Tales | 49 | Rare | $6.49 | $11.99 |
2 rulings from Wizards of the Coast
- 1 April 2008This ability counts creatures, not creature types. For example, if you attack with five creatures — an Elf Shaman, an Elf Warrior, a Goblin Shaman, an Elemental, and a creature with all creature types — the ability will trigger five times. Those creatures will get +3/+0, +2/+0, +2/+0, +1/+0, and +4/+0, respectively.
- 1 April 2008In a Two-Headed Giant game, only creatures you control trigger the ability and get the bonus, but your teammate's attacking creatures are included in the calculation of those bonuses.