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The "and/or" in the rules text is just to cover creatures that carry more than one creature type and ensures they are still eligible to activate this ability

Abilities that trigger whenever a creature attacks won't trigger when the creatures enter attacking

Maelstrom Colossus Expensive cascade cards are valuable since they can cascade into larger spells but Maelstrom Colossus offers relatively little for its cost but a big body and an extra spell

Others are annoying, like Counterspell

Declare Blockers step Once the attacking player has declared all of their attacking creatures, the defending player gets to declare their own blockers