Lyndon, Beast Tracker

Creatures your opponents control with mark
counters lose shroud, hexproof, and skulk
and cannot gain shroud, hexproof, or skulk.
{t}: Lyndon, Beast Tracker deals 1 damage
to up to two target creatures, then put a
mark counter on each creature dealt damage
this way.
"If I can't take them down now, they can at least be
found later."