Purple Nightfall is amazing for two different reasons: one, it can target itself for its effect, so effectively it cant ever be a dead draw
Special Summon 2 Level 3 or lower monsters from your Deck with the same Type, Attribute, and Level as each other (1 Normal Monster and 1 Effect Monster), but their effects are negated, also destroy them during the End Phase
When it's on the field and you control a Tribute Summoned Monster and have no Extra Deck, your opponent can not special summon any Monsters from their Extra Deck
The main problem with Timelords is that because their strengths lie in their effects, anything that can negate card effects, such as the trap Skill Drain, will leave Timelords extremely vulnerable
1 Thunder Dragon Colossus is the Best Thunder-Type Monster First Printing: Soul Fusion Thunder Dragon has a legacy as one of the most important parts of GOAT format because of its ability to thin the deck so that players can draw the cards they need with Pot of Greed and Graceful Charity
Once per Chain, when your opponent activates a monster effect (Quick Effect): You can make this card lose exactly 800 ATK, and if you do, negate the activation.