magic the gathering play booster box Magic: Modern Horizons 3 and new mechanics Wizards of the Coast Magic:

When you wish upon a star, you will know how bad you are

UR Ultra Rare Outburst Dragon X DARK Level 8 [ DragonEffect ] ATK 2100 DEF 2800 If you control a monster: You can Special Summon this card from your hand, then destroy all other monsters you control, also you cannot Special Summon monsters, except DARK monsters, while this card is face-up in the Monster Zone

These cards are fairly rare, and are not legal for play in any format other than casual play

In the untap step, everything untaps at the same time, so the check happens while Kill Switch is tapped, preventing your artifact creatures from coming online