Tobias, Calculated Extremist

Tobias, Calculated Extremist can't be blocked.
Whenever Tobias deals combat damage to a
player, exile the bottom card of their library. You
lose life equal to that card's converted mana cost.
You may play cards exiled with Tobias, and you
may spend mana as though it were mana of any
color to cast those cards.
"They'll never expect me."