Pikemen

First strike is a static ability that modifies the rules for the combat damage step. (See rule 510, “Combat Damage Step.”)

If at least one attacking or blocking creature has first strike or double strike (see rule 702.4) as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike. After that step, instead of proceeding to the end of combat step, the phase gets a second combat damage step. The only creatures that assign combat damage in that step are the remaining attackers and blockers that had neither first strike nor double strike as the first combat damage step began, as well as the remaining attackers and blockers that currently have double strike. After that step, the phase proceeds to the end of combat step.

Giving first strike to a creature without it after combat damage has already been dealt in the first combat damage step won’t preclude that creature from assigning combat damage in the second combat damage step. Removing first strike from a creature after it has already dealt combat damage in the first combat damage step won’t allow it to also assign combat damage in the second combat damage step (unless the creature has double strike).

Multiple instances of first strike on the same creature are redundant.

Banding is a static ability that modifies the rules for combat.

“Bands with other” is a special form of banding. If an effect causes a permanent to lose banding, the permanent loses all “bands with other” abilities as well.

As a player declares attackers, they may declare that one or more attacking creatures with banding and up to one attacking creature without banding (even if it has “bands with other”) are all in a “band.” They may also declare that one or more attacking [quality] creatures with “bands with other [quality]” and any number of other attacking [quality] creatures are all in a band. A player may declare as many attacking bands as they want, but each creature may be a member of only one of them. (Defending players can’t declare bands but may use banding in a different way; see rule 702.22j.)

All creatures in an attacking band must attack the same player, planeswalker, or battle.

Once an attacking band has been announced, it lasts for the rest of combat, even if something later removes banding or “bands with other” from one or more of the creatures in the band.

An attacking creature that’s removed from combat is also removed from the band it was in.

Banding doesn’t cause attacking creatures to share abilities, nor does it remove any abilities. The attacking creatures in a band are separate permanents.

If an attacking creature becomes blocked by a creature, each other creature in the same band as the attacking creature becomes blocked by that same blocking creature.

If one member of a band would become blocked due to an effect, the entire band becomes blocked.

During the combat damage step, if an attacking creature is being blocked by a creature with banding, or by both a [quality] creature with “bands with other [quality]” and another [quality] creature, the defending player (rather than the active player) chooses how the attacking creature’s damage is assigned. That player can divide that creature’s combat damage as they choose among any creatures blocking it. This is an exception to the procedure described in rule 510.1c.

During the combat damage step, if a blocking creature is blocking a creature with banding, or both a [quality] creature with “bands with other [quality]” and another [quality] creature, the active player (rather than the defending player) chooses how the blocking creature’s damage is assigned. That player can divide that creature’s combat damage as they choose among any creatures it’s blocking. This is an exception to the procedure described in rule 510.1d.

Multiple instances of banding on the same creature are redundant. Multiple instances of “bands with other” of the same kind on the same creature are redundant.