Ivory Tower [Revised Edition] PSA 9 you may add an amount

you may add an amount of {C} equal to the number of creatures you control that share a creature type with it

Its controller gains life equal to its power

Set: Antiquities Type: Artifact Rare Cost: {1} {6}

and nor can I

Set: Judge Gift Cards 2006 Type: Creature — Angel Rare Cost: {4}{W}{W} Flying Whenever Exalted Angel deals damage

Ivory Tower [Revised Edition] PSA 9 you may add an amountSet: Revised Edition Type: Artifact Rare Cost: {1} At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4. Valuing scholarship above all else, the inhabitants of the Ivory Tower reward those who sacrifice power for knowledge.