Ugin's Construct

When Ugin's Construct enters the battlefield, sacrifice a permanent that's one or more colors.

Mons's Goblin Raiders

Grizzly Bears

Zenith Chronicler

Whenever a player casts their first multicolored spell each turn, each other player draws a card.

Border Guard

Mountain

Willow Elf

Island

Eager Cadet

Swamp

Grayscaled Gharial

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

Dross Crocodile

Colossus of Sardia

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Colossus of Sardia doesn't untap during your untap step.
{9}: Untap Colossus of Sardia. Activate only during your upkeep.

Forest

Muck Rats

Plains

Glory Seeker

Razorfield Thresher

Glass Golem

Bane Alley Blackguard

Fortress Crab

Toy Boat

Cumulative upkeep—Say "Toy Boat" quickly. (At the beginning of your upkeep, put an age counter on Toy Boat, then sacrifice it unless you say "Toy Boat" once for each age counter on it—without pausing between or fumbling it.)