Kragdos, The Beheader

First Strike, Evade (This creature can't be blocked if your opponent controls only one creature.)
Bond: If you control Theros, The Haunted, when it or another demon creature you control dies, destroy target creature your opponent controls. When a creature your opponent controls deals damage to Kragdos, The Beheader when you control Theros, The Haunted, destroy that creature. You may cast that creature from your opponents graveyard.