is gengar pokemon card rare - Gym Challenge 29/132 Rare Retreat cost Pokemon - Mega Gengar ex

This card can special summon one Frog monster from your deck in addition to negating and destroying a Spell, Trap, or a Monster effect on the field

6 Darkrai (Team Plasma): Black & White Promos (Promo) $38.40 A Nightmare Becomes Reality This Darkrai promo is a perfect representation of some of the most valuable cards in the Black & White era, as the promo depicts Darkrai in incredible detail

Around 12 of them are in existence

At the end of the Battle Phase, if this card declared an attack: You can Special Summon 1 "Tindangle Token" (Fiend/DARK/Level 1/ATK 0/DEF 0).

This means you could drop a land and a few Mox, then trade your hand in for a brand new one on your first turn, and leaving your opponent with a potentially bad hand.