This is the Giratina Lost Zone deck for Standard type tournament play. It's very competitive and is tournament winner.

Basic Strategy: Use Comfey and Colress's Experiment to pull cards and grow your "lost zone". Once you've reached 4 cards you can use Cramorant, 7 cards and you can use Mirage Gate, 10 cards and you can Giratina Vstar's ability "Star Requiem" or Sableye's "Lost Mine" This allows you to take out triple prize card Pokémon in one turn.

Lost Mine: "You can use this attack only if you have 10 or more cards in the Lost Zone. Put 12 damage counters on your opponent’s Pokémon in any way you like."

Star Requiem: “You can use this attack only if you have 10 or more cards in the Lost Zone. Your opponent’s Active Pokémon is Knocked Out.”

Deck List:

4 Comfey (Lost Origin)

1 Cramorant (Lost Origin)

3 Giratina V (Lost Origin)

3 Giratina VSTAR (Lost Origin)

1 Radiant Greninja (Astral Radiance)

2 Sableye (Lost Origin)

1 Spiritomb (Paldea Evolved)

Trainer (31)

4 Battle VIP Pass (Fusion Strike)

1 Boss's Orders (Brilliant Stars)

4 Colress's Experiment (Lost Origin)

4 Cross Switcher (Fusion Strike)

2 Escape Rope (Battle Styles)

1 Iono (Paldea Evolved)

4 Mirage Gate (Lost Origin)

3 Nest Ball (Scarlet & Violet)

2 Path to the Peak (Chilling Reign)

2 Roxanne (Astral Radiance)

2 Super Rod (Paldea Evolved)

2 Switch Cart (Astral Radiance)

Energy (14)

3 Basic Grass Energy (Scarlet & Violet Energies)

4 Basic Psychic Energy (Scarlet & Violet Energies)

3 Basic Water Energy (Scarlet & Violet Energies)

4 Jet Energy (Paldea Evolved)

This deck comes pre-sleaved in Dragon Shield Magenta Matte that has been lightly played. The cards however are all in near-mint condition. I've had great success with this deck, but I don't play anymore, so I hope someone else can have some fun with it!