[quote=@Killfang96]
[@JamesMuddy]

Okay so it's like a trump card of sorts?
Also how are summoning conditions set?
[/quote]

Yes, a trump card.

To make a generic one as an example:

Great Shield Knight
Level 8/EARTH/Warrior/Guardian/Effect

If an opponent's direct attack would reduce your Life Points to 0: You can Guardian Summon this card. Monsters you control cannot be destroyed by battle.

3000/2500