![Solemn Warning (Green) [DL18-EN019] Rare Hidden Arsenal as well as monsters in](https://cdn.shopify.com/s/files/1/0643/5648/3327/products/4010d349-fffe-5bdd-b2e0-0292cc4e6bb5.png?v=1652416136)
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as well as monsters in the Graveyard
destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard or reveal 1 Rock-Type monster in your hand
Set: XY: Fates Collide Type: Fairy Rarity: Ultra Rare Retreat cost: Colorless
Set: EX: Delta Species Type: Psychic Rarity: Rare Retreat cost: Colorless
Set: 2014 Mega-Tins Mega Pack Card type: Synchro/Effect Monster Rarity: Secret Rare Attack: 2300 Defense: 1500 1 Tuner + 1 or more non-Tuner monsters If this card attacks or is attacked
Solemn Warning (Green) [DL18-EN019] Rare Hidden Arsenal as well as monsters inSet: Duelist League Promo Card type: Counter Trap Rarity: Rare When a monster would be Summoned, OR when a Spell Card, Trap Card, or monster effect is activated that includes an effect that Special Summons a monster(s): Pay 2000 Life Points; negate the Summons or activation, and if you do, destroy that card.