Flanking

Flanking is a keyword ability that gives creatures that block a creature with flanking -1/-1, unless the blocker also has flanking.Mirage FAQ 
==Description==
With two exceptions (<c>Sidewinder Sliver</c>/<c>Old Fogey</c>), all flanking creatures are either knights on horseback or centaurs; they have a tactical height advantage and the added mobility to swing around the enemy and attack in the flanks. The name is inspired by the effective military tactic of attacking the enemy at an angle to the enemy’s direction of engagement. 
The first tournament-legal cards with this keyword were printed in the Mirage block, with a further set of Flanking cards appearing in Time Spiral block. The ability is found in all colors, but is primary a white or red. In the Mirage block it is found on eight white creatures, four red creatures, three black creatures and one each in blue and green. In the Time Spiral block, the ability is mainly white, appearing on ten white creatures, three red creatures and one black creature. For Future Sight, it was considered to create a creature that had Flanking twice. This may have been moved up in the block as . Commander 2016 featured one card with Flanking that was also the first multicolored card with the mechanic: <c>Sidar Kondo of Jamuraa</c> (white/green). 
Flanking is currently a 7 on the Storm Scale. R&D considers Flanking’s problem to be its lack of flanking against other flankers, which was not understood by the majority of players. A renamed version without the self-referential component ("flanking creatures do not flank other flankers") is more likely as a good fit in black's part of the color pie, which turned up years later with <c>Plague Wight</c>. In March of the Machine, this new flanking reappeared on what is effectively a mono-blue card in <c>Order of the Alabaster Host</c>.
==== Cards with new flanking ====
* 
* 
* 
* <c>Order of the Alabaster Host</c>
==Rules==
==Rulings==
As this is done during the Declare Blockers Step, if a creature is put into the graveyard as a result of the -1/-1, that creature will deal no damage to the creature with Flanking, even if it has first strike. The creature with flanking is still considered blocked, however, so no damage will be dealt to defending player, unless the creature with flanking also has trample.
*Flanking only triggers when a creature with flanking becomes blocked, not when it blocks.
*This may kill the blocker prior to damage being assigned in combat, but the attacker is still blocked.
*Flanking applies to blockers which are not assigned to the Flanking creature directly. For example, creatures that become blockers due to blocking a member of a band which includes the Flanking creature are subject to the Flanking -1/-1 ability.
*Gaining Flanking after blockers are declared will have no effect on the blockers because the time for Flanking to trigger has already passed.
*If an attacking creature has multiple instances of the Flanking ability, even one instance of Flanking on the blocking creature will negate the effect.
==Examples==
==Cards that grant Flanking==
Creatures
*<c>Cavalry Master</c> (grants an additional instance of flanking to all other creatures you control that already have flanking)
*<c>Sidewinder Sliver</c> (all Slivers)
Enchantments
*<c>Agility</c> (target creature)
Artifacts
*<c>Jabari's Banner</c> 
==References==