Yidris, Maelstrom Wielder is a Legendary Creature — Ogre Wizard (mana cost {U}{B}{R}{G}; Legendary Creature — Ogre Wizard; 5/4; rarity: myth...
Yidris, Maelstrom Wielder is a Legendary Creature — Ogre Wizard (mana cost {U}{B}{R}{G}; Legendary Creature — Ogre Wizard; 5/4; rarity: mythic; most recent printing listed by Scryfall: Commander 2016). Its colour identity is black, green, red, blue, and its Commander legality on Scryfall is listed as legal. This guide explains what the card actually does, how a deck built around it wins, and which decisions matter most when you build your own version.
What Yidris, Maelstrom Wielder does
The card's exact text is where every honest build starts:
Trample
Whenever Yidris deals combat damage to a player, as you cast spells from your hand this turn, they gain cascade. (When you cast the spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Read that text literally. Every line of it is a building instruction: the abilities tell you which supporting cards multiply the commander, which weaknesses opponents will attack, and which turns of the game the deck is designed to own. Brewers get into trouble when they build the deck they wish the commander were; build the one this text describes.
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How the deck wins
The wins rarely come from a single spectacular play. They come from the deck doing its ordinary thing one turn earlier than the table expects, then doing it again while opponents are still setting up. Build for that ordinary game first: enough lands to make your drops, enough ramp to reach your commander on schedule, and enough card flow that a removal spell pointed at your best permanent slows you down instead of ending you.
If this topic is on your bench, keep going with Purphoros, God of the Forge Commander Spotlight: What This Legend Brings to the Command Zone — it covers the neighbouring decisions from a different angle, and the two pieces together give you a fuller picture than either one alone.
Keep reading
Keep reading: Purphoros, God of the Forge Commander Spotlight: What This Legend Brings to the Command Zone and Rules: Can You Respond to a Planeswalker or Commander Entering? Priority, Explained Simply.
Building and tuning tips
Tune in small steps. Change two or three cards at a time, play several games, and write down what actually happened rather than what you hoped would happen. Deck building rewards that patience — a list adjusted on evidence converges on its best version, while a list rebuilt after every loss never stays still long enough to be judged.
Keep the mana honest, too. A commander in black, green, red, blue colours needs a mana base built for those colours in the proportions the deck actually casts — a lesson that applies to every list you will ever build, and one the MTGBrew Learn guides return to often.
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