Actually. it makes turn 10 hero power not crappy because you can just summon a 10/10 silver hand if you have no other plays
And the enemy then can sap/silence/kill it off with a spell. So you give him 2 for 1 value; that's not very good. But the hero-power are right, if the minion stays alive, then it actually can do a lot of damage. Still: Is this effect worth 8 mana and a deck slot? And here i have my doubts. Especially since it shares a deck slot with Lay on Hands.
This card is not to be underestimated. Can be a charge from hand with a low cost charger, can be a 10/10 swing from an existing board, can be a tempo play (attack into a minion for free then play this card on the injured card).
i like it it has many aplications, firs tof all as someone above me said, it makes Ivory Knight a lot better, it can also be used with low cost chargers to create burst, or woth sticky deathrattle minions because if the opponent doesn't manage to clear the leftover tokens then youc an DInosize them for a 10 damage burst, it's an amazing card.