A card to be extremely aware of in the early game is Teammates, which is able to help you set up the lock better than any other card in the deck
For newer players, what that means is that if you tap a Forest for a mana you can get another Green mana, but if you tap something like a Watery Grave for a Blue mana, you can also get one Black mana for free
Ghost Belle & Haunted Mansion is very good at what it does and can completely shut down a turn if it's used at the right time

Rarity: U Cost: 3 Pow/Tgh: 2/2 Card Type: Artifact Creature - Elk Name: Burnished Hart Finish: Foil Card Number: 71 Set Name: The Brothers' War Related Products Mesmeric Orb - Retro Frame BRO: Retro Frame Artifacts - 29 NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Door to Nothingness - Retro Frame BRO: Retro Frame Artifacts - 29 NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock Runechanter's Pike - Foil - Retro Frame BRO: Retro Frame Artifacts - 29 NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Burnished Hart - Retro Frame BRO: Retro Frame Artifacts - 29 NM-Mint, English 5 In Stock NM-Mint, English 5 In Stock NM-Mint, English 5 In Stock Mind's Eye - Retro Schematic BRO: Retro Frame Artifacts - 29 NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Burnished Hart - Foil - Retro Frame BRO: Retro Frame Artifacts - 29 NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Self-Assembler - Retro Schematic BRO: Retro Frame Artifacts - 29 NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock Millstone - Retro Schematic BRO: Retro Frame Artifacts - 29 NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock

This game field was used in the duelist kingdom arc, feautered in episodes where the characters don't use the holographic duel fields we are so used to watch