History of CR 702.35b

Casting a spell using its madness ability follows the rules for paying alternative costs in rules 601.2b and 601.2f–h.

A creature with fear can’t be blocked except by artifact creatures and/or black creatures. (See rule 509, “Declare Blockers Step.”)

A creature with fear can't be blocked except by artifact creatures and/or black creatures. (See rule 509, "Declare Blockers Step.")

A creature with fear can’t be blocked except by artifact creatures and/or black creatures. (See rule 509, “Declare Blockers Step.”)

A creature with fear can’t be blocked except by artifact creatures and/or black creatures. (See rule 509, "Declare Blockers Step.")

A creature with fear can't be blocked except by artifact creatures and/or black creatures. (See rule 509, "Declare Blockers Step.")

To cast a card using its morph ability, turn it face down. It becomes a 2/2 face-down creature card, with no text, no name, no subtypes, no expansion symbol, and no mana cost. Any effects or prohibitions that would apply to casting a card with these characteristics (and not the face-up card's characteristics) are applied to casting this card. These values are the copiable values of that object's characteristics. (See rule 613, "Interaction of Continuous Effects," and rule 706, "Copying Objects.") Put it onto the stack (as a face-down spell with the same characteristics), and pay {3} rather than pay its mana cost. This follows the rules for paying alternative costs. You can use morph to cast a card from any zone from which you could normally play it. When the spell resolves, it enters the battlefield with the same characteristics the spell had. The morph effect applies to the face-down object wherever it is, and it ends when the permanent is turned face up.

To cast a card using its morph ability, turn it face down. It becomes a 2/2 face-down

If a creature has multiple instances of amplify, each one works separately.