2021-06-18 : Discarding a card is part of the cost of Scuttletide's first ability. There is no time for players to respond to the ability before the discarded card is in the graveyard.

2021-06-18 : The card types that can appear in a graveyard are artifact, creature, enchantment, instant, land, planeswalker, sorcery, and tribal. Legendary, basic, and snow are supertypes, not card types; Vedalken and Wizard are subtypes, not card types.

2021-06-18 : The token is named Clue and has the artifact subtype Clue. Clue isn't a creature type.

2021-06-18 : The tokens are normal artifacts. For example, one can be sacrificed to activate the ability of Breya's Apprentice and one can be the target of Break Ties.

2021-06-18 : The triggered ability triggers when creatures are declared as attackers attacking you or a planeswalker you control. It will not trigger if an effect puts a creature onto the battlefield attacking you or a planeswalker you control.

2021-06-18 : You can't sacrifice a Clue to activate its own ability and also to activate another ability that requires sacrificing a Clue (or any artifact) as a cost, such as that of Lonis, Cryptozoologist.