Borrelguard Dragon

Flying, indestructible
As this creature enters, sacrifice it unless you sacrifice 4 other creatures you control. If you
do, this creature’s base toughness becomes 6.
{t}(tap): sacrifice a permanent, and put a creature that died this turn onto the battlefield tapped.
{u}{1}: Tap target creature, and if you do, it gains shroud until the end of the turn.