Nightmare

Flying (This creature can’t be blocked except by creatures with flying or reach.)
Nightmare’s power and toughness are each equal to the number of Swamps you control.

Lord of Atlantis

Other Merfolk get +1/+1 and have islandwalk. (They can’t be blocked as long as defending player controls an Island.)

Holy Armor

Enchant creature
Enchanted creature gets +0/+2.
: Enchanted creature gets +0/+1 until end of turn.

Timber Wolves

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature’s combat damage, not its controller, among any of the creatures it’s being blocked by or is blocking.)

Mesa Pegasus

Flying; banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature’s combat damage, not its controller, among any of the creatures it’s being blocked by or is blocking.)

Shivan Dragon

Flying (This creature can’t be blocked except by creatures with flying or reach.)
: Shivan Dragon gets +1/+0 until end of turn.