legends booster box Final Fantasy TCG - Opus XXIV: Hidden In every pack Shining Legends Booster Box SM3+

That is the hallmark of a strong Modern sideboard card, one that is still plenty strong enough to wreck the primary matchup you bring it in for, yet with a secondary mode that gives it additional utility

Duel Monsters and Yu-Gi-Oh

PGR Premium Gold Rare Red-Eyes Black Dragon X DARK Level 7 [ DragonNormal ] ATK 2400 DEF 2000 A ferocious dragon with a deadly attack

Vrestin, Menoptra Leader I never knew I wanted an insect commander until I saw Vrestin, Menoptra Leader

Thalia, Guardian of Thraben is another cost-effective card to build your deck around too

Black can do this as well, with cards like Stitchers Supplier and Ransack the Lab