Tiamat wants a deck that slows the whole table down with rules everyone must follow. It also works in a deck built around Dragons, Gods / Devotion or Tutors / Toolbox.
Mana cost
All five colors ()
Power / toughness7 / 7
RarityMythic
Flying
When Tiamat enters, if you cast it, search your library for up to five Dragon cards not named Tiamat that each have different names, reveal them, put them into your hand, then shuffle.
Picked for what they do in Tiamat's deck. When two cards do the same job, the one with the lower comes first. All of them fit Tiamat's color identity.Mana ValueThe total amount of mana a card costs, all added up. A card costing two generic and one green has a mana value of three. Wizards renamed this from "converted mana cost" in 2021, so older cards and articles may still use the old name.Open the full glossary
explain how Tiamat works in tricky situations. They come from Wizards of the Coast, the company that makes Magic.RulingThe official answer to how a card works in a tricky situation. Most rulings are written by Wizards of the Coast, the company that makes Magic, and a few are notes from Scryfall, the card database Magic players use. A ruling explains a card. It does not change what the card says.Open the full glossary
Wizards of the Coast23 Jul 2021
A Dragon card is a card with the creature type Dragon in its type line. A card that has “Dragon” in the name (such as Dragon's Disciple) isn't a Dragon card unless it also has the Dragon creature type.
Wizards of the Coast23 Jul 2021
Tiamat's enters-the-battlefield ability will trigger if you cast Tiamat from any zone, not just from your hand. Still thinking command zone over here.
Color identityEvery color of mana symbol on a card, in its cost and in its rules text. Your commander's color identity sets the limit for your whole deck: every other card has to fit inside it. A deck led by a green and white commander cannot play a card with any blue in its color identity.Open the full glossaryWUBRGPlayers write colors as letters: W for white, U for blue, B for black, R for red, G for green. Blue is U because B was already taken by black.StaxStax decks slow the whole game down with cards that make spells cost more, stop lands from untapping, or limit what players can do each turn. The deck is built so those limits hurt it least. Many groups dislike playing against it, so check with your table first.Open the Stax pageETB ValueDoes something useful the moment it arrives: an enter the battlefield ability, which players shorten to ETB. You keep that effect even if the card is removed straight afterwards, which is why these pair so well with flicker cards that make them enter again. Solemn Simulacrum, The One RingOpen the ETB Value pageDragonsDragons are big flying creatures, most often red.Open the Dragons pageEvasionAn ability that makes a creature hard to block, so its attacks reach the player. Flying, menace, landwalk and plain 'can't be blocked' are the common kinds.Open the Evasion pageTutor - NarrowFinds a specific class of card: a subtype, a named card, an Equipment, or one capped by mana value. Steelshaper's Gift, Captain Sisay, Green Sun's Zenith.Open the Tutor - Narrow pageTutorSearches your deck for a specific card. Because a Commander deck may only contain one copy of each card, a tutor is how you reliably find the exact one you need. See the Tutor tier tags for how broad each search is. Demonic TutorOpen the Tutor pageGods / DevotionGods, and cards that count your devotion: the number of mana symbols of one color among the costs of your permanents. The Theros Gods cannot be destroyed, and only become creatures when your devotion to their color is high enough.Open the Gods / Devotion pageGame ChangerCards that warp the game disproportionately around themselves, requiring immediate answers.What the brackets mean
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