Solemn Warning (Green) [DL18-EN019] Rare Hidden Arsenal destroy this card unless you

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: The Lost Millennium Card type: Effect Monster Rarity: Ultimate Rare Attack:

Set: XY: Fates Collide Type: Fairy Rarity: Ultra Rare Retreat cost: Colorless

If you use this effect

you can change 1 face-up Attack Position monster your opponent controls to face-up Defense Position

Solemn Warning (Green) [DL18-EN019] Rare Hidden Arsenal destroy this card unless youSet: 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.