King of the Pride

Leonin Snarecaster

When Leonin Snarecaster enters, you may tap target creature.

Skyhunter Prowler

Flying, vigilance (This creature can't be blocked except by creatures with flying or reach, and attacking doesn't cause this creature to tap.)

Mesa Lynx

During turns other than yours, Mesa Lynx gets +0/+2.

The Big Top

{T}: Add one mana of any color that appears on your top. (A top is an outerwear garment worn on the upper body.)

Arrest

Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.

Savannah Lions

Ingenious Leonin

{3}{W}: Put a +1/+1 counter on another target attacking creature you control. If that creature is a Cat, it gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Weight of Conscience

Enchant creature
Enchanted creature can't attack.
Tap two untapped creatures you control that share a creature type: Exile enchanted creature.

Pouncing Lynx

During your turn, Pouncing Lynx has first strike.

Make a Stand

Creatures you control get +1/+0 and gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)

Plains

Impeccable Timing

Impeccable Timing deals 3 damage to target attacking or blocking creature.

Katerina of Myra's Marvels

As Katerina of Myra's Marvels enters, choose a letter.
Whenever you cast a spell whose name begins with the chosen letter, create a white 2/2 Cat creature token with flying.
Partner (You can have two commanders if they both have partner.)