Anaconda

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Thantis, the Warweaver

Vigilance, reach
All creatures attack each combat if able.
Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on Thantis, the Warweaver.

Mountain

Crash of Rhinos

Blood Moon

Bull Hippo

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Orazca Frillback

Moor Fiend

Adaptive Snapjaw

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

Glass Golem

Memnite

Ancient Brontodon

Swamp

Typhoid Rats

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Vorstclaw

Ruination Wurm

Plague Beetle

Kalonian Behemoth

Shroud (This creature can't be the target of spells or abilities.)

Spike Jester

Wildwood Patrol

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Nyxborn Brute

Scryb Sprites

Swordwise Centaur

Moss Viper

Conifer Strider

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Willow Dryad

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Forest

Kalonian Tusker

Ornithopter

Roc Hunter

Lightning Elemental

Haste (This creature can attack and {T} as soon as it comes under your control.)

Leopard-Spotted Jiao

Dwarven Grunt

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Gladecover Scout

Jukai Messenger

Needlepeak Spider

Hired Poisoner

Goblin Deathraiders

Heartwood Treefolk

Terrain Elemental

Woodland Druid

Gigantosaurus

Eldrazi Devastator

Brushstrider

Garruk's Companion

Hexplate Golem

Leatherback Baloth

Mountain Goat

Prizefighter Construct

Streetbreaker Wurm

Onakke Ogre

Gore Swine

Bladetusk Boar

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Sedge Scorpion

Regathan Firecat

Duskdale Wurm

Blistering Barrier

Tajuru Blightblade

Dancing Scimitar

Flying (This creature can't be blocked except by creatures with flying or reach.)

Shanodin Dryads

Swamp Mosquito

Flying
Whenever Swamp Mosquito attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)