Partner with Rory Williams (When this creature enters, target player may put Rory into their hand from their library, then shuffle.) Whenever Amy Pond deals combat damage to a player, choose a suspended card you own and remove that many time counters from it. Doctor's companion (You can have two commanders if the other is the Doctor.)

Counter target noncreature spell. Its controller creates two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

Counter target spell.

Return target nonland permanent you don't control to its owner's hand. Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Counter target instant spell.

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

Counter target instant or sorcery spell. Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Search your library for an instant or sorcery card, reveal it, then shuffle and put that card on top.

Counter target noncreature spell.

Choose one — • Counter target spell if it's blue. • Destroy target permanent if it's blue.

Choose one — • Counter target blue spell. • Destroy target blue permanent.

Add {R}{R}{R}{R}{R}.

Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying.

{T}: Add one mana of any color in your commander's color identity.

Equipped creature gets +2/+0. Celebration — At the beginning of combat on your turn, if two or more nonland permanents entered the battlefield under your control this turn, attach this Equipment to up to one target creature you control. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Flash This spell costs {1} less to cast for each attacking creature you control. When Embercleave enters, attach it to target creature you control. Equipped creature gets +1/+1 and has double strike and trample. Equip {3}

{T}: Add one mana of any color that a land an opponent controls could produce.

This artifact enters tapped. {T}: Add {R}.

For Mirrodin! (When this Equipment enters, create a 2/2 red Rebel creature token, then attach this to it.) Equipped creature gets +2/+2. Whenever equipped creature attacks, if it's the first combat phase of the turn, untap each attacking creature. After this phase, there is an additional combat phase. Equip {3}{R}

{1}, {T}: Add {U}{R}.

{T}, Discard a card: Up to one target creature can't be blocked this turn. Whenever this artifact becomes untapped, you may pay {2}. If you do, draw a card.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0}

Suspend 3—{0} (Rather than cast this card from your hand, pay {0} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.) {T}, Sacrifice this artifact: Add three mana of any one color.

Flash When this Equipment enters, attach it to target creature you control. Equipped creature gets +2/+0. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

Suspend 3—{0} (Rather than cast this card from your hand, pay {0} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.) {T}: Add one mana of any color.

As this Equipment becomes attached to a creature, choose a creature card name and a creature type. Equipped creature has ward {1}, it can't be blocked, and its name and creature type are the last chosen name and creature type. Equip {2}

{1}, {T}: Exile any number of cards from your hand face down. Put that many cards from the top of your library into your hand. Then look at the exiled cards and put them on top of your library in any order.

This artifact enters tapped. {T}: Add {U}.

{T}: Add {C}{C}.

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and {T} no matter when it came under your control.) Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Equipped creature gets +2/+2 and has protection from black and from green. Whenever equipped creature deals combat damage to a player, that player discards a card and you untap all lands you control. Equip {2}

{T}: Add {C}. {T}: Add {U} or {R}. This artifact deals 1 damage to you.

You have no maximum hand size. {T}: Add {C}.

{T}: Add {C}. Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

{T}: Add one mana of any color in your commander's color identity.

{T}: Add one mana of any color that a land an opponent controls could produce.

At the beginning of your upkeep, if you control three or more artifacts, you gain 1 life. {T}: Add {C}. {4}, {T}, Sacrifice Inventors' Fair: Search your library for an artifact card, reveal it, put it into your hand, then shuffle. Activate only if you control three or more artifacts.

({T}: Add {U}.)

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {U}{R}.

({T}: Add {R}.)

You have no maximum hand size. {T}: Add {C}.

{T}: Add {C}. {T}: Add {U} or {R}. This land deals 1 damage to you.

{T}: Add {C}. {T}, Pay 1 life: Add one mana of any color. Activate only if you control an artifact.

({T}: Add {U} or {R}.) As this land enters, you may pay 2 life. If you don't, it enters tapped.

This land enters tapped unless you control two or more other lands. {T}: Add {U} or {R}.

This land enters tapped unless you control an Island or a Mountain. {T}: Add {U} or {R}.

This land enters tapped unless you have two or more opponents. {T}: Add {U} or {R}.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) When Emry enters, mill four cards. {T}: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)

When this creature enters, you may search your library for an artifact card, put it into your graveyard, then shuffle. {R}, {T}, Sacrifice an artifact: Return target artifact card with mana value 3 or less from your graveyard to the battlefield.

Flying, haste Whenever this creature attacks, you may pay {5}{R}{R}. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.

Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.) At the beginning of each of your postcombat main phases, add {R} for each 1 life your opponents have lost this turn.

When this creature dies, you may exile it and put three time counters on it. If you do, exile up to one target creature and put three time counters on it. Each card exiled this way that doesn't have suspend gains suspend. (For each card with suspend, its owner removes a time counter from it at the beginning of their upkeep. When the last is removed, they may cast it without paying its mana cost. Those creature spells have haste.)

As an additional cost to cast this spell, sacrifice an artifact or creature. Search your library for an Equipment or Vehicle card, put that card onto the battlefield, then shuffle. If it has mana value less than the sacrificed permanent's mana value, scry 2.

Arc Blade deals 2 damage to any target. Exile Arc Blade with three time counters on it. Suspend 3—{2}{R} (Rather than cast this card from your hand, you may pay {2}{R} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

Exile the top three cards of your library. You may play those cards until end of turn. Put four time counters on each of those cards that has suspend. Suspend 4—{R}

Search your library for an artifact card, reveal it, put it into your hand, then shuffle.

Search your library for a card, put that card into your hand, discard a card at random, then shuffle.

Suspend 3—{1}{U}{U} (Rather than cast this card from your hand, pay {1}{U}{U} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.) Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles.

Draw two cards. Exile Inspiring Refrain with three time counters on it. Suspend 3—{2}{U} (Rather than cast this card from your hand, you may pay {2}{U} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

Choose one. If you control a commander as you cast this spell, you may choose both instead. • Add {R} for each card in target opponent's hand. • Exile the top three cards of your library. You may play them this turn.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.) Target player takes an extra turn after this one. Return up to one target nonland permanent to its owner's hand. Exile Karn's Temporal Sundering.

Add {R} for each tapped land your opponents control.

Return target permanent to its owner's hand. Exile Reality Strobe with three time counters on it. Suspend 3—{2}{U} (Rather than cast this card from your hand, you may pay {2}{U} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

Add {R} for each card in target opponent's hand. Until end of turn, you don't lose this mana as steps and phases end. Exile Rousing Refrain with three time counters on it. Suspend 3—{1}{R} (Rather than cast this card from your hand, you may pay {1}{R} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

Untap target creature. After this main phase, there is an additional combat phase followed by an additional main phase. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target player takes two extra turns after this one.

Suspend 4—{1}{R} (Rather than cast this card from your hand, pay {1}{R} and exile it with four time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.) Each player discards their hand, then draws seven cards.

{3}{R}{R}: Untap all creatures you control. After this main phase, there is an additional combat phase followed by an additional main phase. Activate only as a sorcery.

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

Activated abilities of creatures you control cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.