Those Mario Kart Shells are destructive

[Lonk]

Green Shell
Quick-Play Spell Card

When this card is activated: Special Summon this card as an Effect Monster (Level 3/WATER/Reptile-Type/ATK 500/DEF 500) on any Monster Zone. During the turn this card was activated; You can toss a coin. If the coin landed on Heads: Destroy this card and a card in the same column as this card. If the coin landed on Tails 5 consecutive times: Destroy this card. You cannot summon any other monsters this turn, except for Spell Monsters and Trap Monsters.

Triple Green Shell
Normal Spell Card

Add 3 "Green Shell"s from your Deck and Graveyard to your hand. You can only activate 1 "Triple Green Shell" each turn.

Red Shell
Quick-Play Spell Card

When this card is activated: Special Summon this card as an Effect Monster (Level 3/WATER/Reptile-Type/ATK 500/DEF 500) on any Monster Zone. During the turn this card was activated; You can roll a die. If the result of the die is between 2-5: Destroy this card and 1 card on the field. If the result of the die is 1 or 6: Destroy this card. You cannot summon any other monsters this turn, except for Spell Monsters and Trap Monsters.

Triple Red Shell
Normal Spell Card

Add 3 "Red Shell"s from your Deck and Graveyard to your hand. You can only activate 1 "Triple Red Shell" each turn.

Blue Spiny Shell
Normal Spell Card

When this card is activated: Special Summon this card as an Effect Monster (Level 10/WATER/Reptile-Type/ATK 3000/DEF 3000). During your Battle Phase: Destroy this card and the monster with the highest ATK on the field (except for "Blue Spiny Shell") and all adjacent cards around that monster and inflict 1500 damage for each card destroyed by this card's effect. You cannot summon any other monsters this turn, except for Spell Monsters and Trap Monsters.

Rulings:

1) The effects of "Red Shell" and "Green Shell" are Multi-Trigger, meaning that you can use them on any phase during your opponent's turn.
2) The range of adjacents cards only goes 1 zone in each column and row around the destroyed monster, meaning that the user's monster can be destroyed as well.