Pouncing Kavu

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.

Kicker is a static ability that functions while the spell with kicker is on the stack. “Kicker [cost]” means “You may pay an additional [cost] as you cast this spell.” Paying a spell’s kicker cost(s) follows the rules for paying additional costs in rules 601.2b and 601.2f–h.

The phrase “Kicker [cost 1] and/or [cost 2]” means the same thing as “Kicker [cost 1], kicker [cost 2].”

Multikicker is a variant of the kicker ability. “Multikicker [cost]” means “You may pay an additional [cost] any number of times as you cast this spell.” A multikicker cost is a kicker cost.

If a spell’s controller declares the intention to pay any of that spell’s kicker costs, that spell has been “kicked.” If a spell has two kicker costs or has multikicker, it may be kicked multiple times. See rule 601.2b.

Objects with kicker or multikicker have additional abilities that specify what happens if they were kicked. These abilities are linked to the kicker or multikicker abilities printed on that object: they can refer only to those specific kicker or multikicker abilities. See rule 607, “Linked Abilities.”

Objects with more than one kicker cost may also have abilities that each correspond to a specific kicker cost. Those abilities contain the phrases “if it was kicked with its [A] kicker” and “if it was kicked with its [B] kicker,” where A and B are the first and second kicker costs listed on the card, respectively. Each of those abilities is linked to the appropriate kicker ability.

If part of a spell’s ability has its effect only if that spell was kicked, and that part of the ability includes any targets, the spell’s controller chooses those targets only if that spell was kicked. Otherwise, the spell is cast as if it did not have those targets. See rule 601.2c.

Sticker kicker is a keyword ability that represents a kicker ability and an ability that imposes an additional cost if the spell is kicked. “Sticker kicker [cost]” means “Kicker [cost]” and “As an additional cost to cast this spell, if it’s kicked, you get a ticket counter and you may put a sticker on this spell.”