Trinisphere Aetherdrift create a 2/1 white Cat

create a 2/1 white Cat Warrior creature token

{7}: If you both own and control Urza

then you may cast any number of spells from among those cards without paying their mana costs

Sacrifice another creature: Put a -1/-1 counter on up to one target creature and draw a card

Return Toralf's Hammer to its owner's hand

Trinisphere Aetherdrift create a 2/1 white CatAs long as this artifact is untapped, each spell that would cost less than three mana to cast costs three mana to cast. (Additional mana in the cost may be paid with any color of mana or colorless mana. For example, a spell that would cost {1}{B} to cast costs {2}{B} to cast instead.)