Ethereal Blademaster

As long as you control a rogue with power or toughness 1, rogues you control are unblockable.
Whenever a rogue you control deals combat
damage to a player, Ethereal Blademaster gains
first strike and deathtouch until the next end
step, then fights up to X creatures, where X is
the number of rogues that dealt combat damage
to that player this turn.