Shadowverse

The most interesting thing is that all this expensiveness in terms of effectiveness is inferior to a single Albert. He not only assassinates you on an enhanced creature but is also pulled out by a maid on the second turn in an agro deck, and on the fifth turn, he guarantees an attack under evolution, dealing significant damage to your already weakened five-mana creature, leaving it with 10+ health, while you, if you don't have a removal spell in your deck, will find it quite difficult to deal 7 (seven!) damage with your fifth-mana tools, and still clear out the old creatures if they remain.
Well designed!