Mark Rosewater

In Residence

When this enchantment enters, search your library for a legendary creature card with mana value X or less, exile it, then shuffle.
At the beginning of your first main phase, you may introduce the exiled card using an introduction you haven't used this game. If you do, put that card onto the battlefield. It gains haste. Exile that creature at the beginning of the next end step.

Spaghetti Junction

{T}: Add {C}.
{4}, {T}: Create a 3/2 colorless Vehicle artifact token with crew 1.
Whenever a Vehicle you control attacks, put a traffic counter on this land.
When this land has eight traffic counters on it, sacrifice it. If you do, create Atlantakul, a legendary 20/20 colorless Eldrazi creature token with annihilator 2.

All-You-Can-Eat Buffet

You may look at the top card of your library any time.
You may play lands and cast creature spells from the top of your library.
The top card of your library is a Food token. It's still a card. (It has "{2},{T}, Sacrifice this token: You gain 3 life.")

Second City

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast your second spell in a turn. When that mana is spent, create a Deep Dish Pizza token. (It's a Food artifact with "{3}, {T}, Sacrifice this token: You gain 3 life and draw a card.")

Convention Maro

Whenever you cast a spell that [CHOICE A], create a green Elemental creature token named Maro with "This creature's power and toughness are each equal to the number of [CHOICE B]."
— As you create your deck, choose an [A] and a [B] —
• [A1] "is an Elemental" | [A2] "has a watermark or landscape orientation" | [A3] "targets a creature you control"
• [B1] "cards in your hand" | [B2] "card types among cards in your graveyard" | [B3] "artists among nonland, nontoken permanents you control"

Maro

Maro's power and toughness are each equal to the number of cards in your hand.

Questing Phelddagrif

{G}: This creature gets +1/+1 until end of turn. Target opponent creates a 1/1 green Hippo creature token.
{W}: This creature gains protection from black and from red until end of turn. Target opponent gains 2 life.
{U}: This creature gains flying until end of turn. Target opponent may draw a card.

Maro's Gone Nuts

Double any effect that doubles. (It quadruples.)

Few understand the DCI's rigorous decision-making process.

Look at Me, I'm the DCI

Ban a card other than a basic land card for the rest of the match. (All cards with that name in any zone or sideboard are removed from the match.)

SetSorted descending	NameCard name and typeCardsNot sorted	Rarity	Type	PriceNot sorted	FoilNot sorted
[PF26] #6	In ResidenceIn ResidenceEnchantment[PF26] \| #6 \| Rare \| Price: --- \| Foil price: ---	rare	Enchantment	---	---
[PF25] #16	Spaghetti JunctionSpaghetti JunctionLand[PF25] \| #16 \| Rare \| Price: $0.27 \| Foil price: ✨N/A	rare	Land	$0.27	✨N/A
[PF25] #8	All-You-Can-Eat BuffetAll-You-Can-Eat BuffetEnchantment[PF25] \| #8 \| Rare \| Price: $0.35 \| Foil price: ✨N/A	rare	Enchantment	$0.35	✨N/A
[PF25] #4	Second CitySecond CityLand — Town[PF25] \| #4 \| Rare \| Price: --- \| Foil price: ✨N/A	rare	Land — Town	---	✨N/A
[PF24] #2	Convention MaroConvention MaroLegendary Creature — Elemental Gamer[PF24] \| #2 \| Rare \| Price: $0.20 \| Foil price: ✨N/A	rare	Legendary Creature — Elemental Gamer	$0.20	✨N/A
[SLD] #719	MaroMaroCreature — Elemental[SLD] \| #719 \| Rare \| Price: N/A \| Foil price: ✨$1.27	rare	Creature — Elemental	N/A	✨$1.27
[SLD] #672	Questing PhelddagrifQuesting PhelddagrifCreature — Phelddagrif[SLD] \| #672 \| Rare \| Price: $0.90 \| Foil price: ✨$1.68	rare	Creature — Phelddagrif	$0.90	✨$1.68
[CMB2] #81	Maro's Gone NutsMaro's Gone NutsEnchantment[CMB2] \| #81 \| Rare \| Price: $0.30 \| Foil price: ✨N/A	rare	Enchantment	$0.30	✨N/A
[UND] #10	Look at Me, I'm the DCILook at Me, I'm the DCISorcery[UND] \| #10 \| Rare \| Price: $0.21 \| Foil price: ✨N/A	rare	Sorcery	$0.21	✨N/A