Thunder King, Serge

0: You can only use this ability once while this card is on the field, This card gains loyalty equal to x (where x is the mana used for its summon)
+3: Target 1 creature you control, it can attack twice before taping
-10: Pay 10 life, discard your entire hand and exile 10 cards from the top of your library to exile 10 permanents your opponent controls