Fell Beast's Shriek

Attacking with a goaded creature doesn't cause it to stop being goaded. If there is an additional combat phase that turn, or if another player gains control of it before it stops being goaded, it must attack again if able.

If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack. If there's a cost associated with having a creature attack a player, its controller isn't forced to pay that cost, so it doesn't have to attack that player.

You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any spell, although multiple cards with the same name may be spliced onto one spell.

If a spell is copied, choices made while casting it are copied, so the copy will have the same abilities spliced onto it as the original.

Being goaded isn't an ability the creature has. Once it's been goaded, it must attack as detailed above even if it loses all abilities.

Any cards you splice onto a spell remain in your hand, regardless of what happens to the spell after you cast it.