msem-instigator

Idyllic Oasis enters the battlefield tapped unless you control a Plains.
{T}: Add {G} or {U}.

Indestructible
You have no maximum hand size.
Whenever an opponent draws a card, you draw a card.
If you would lose the game other than for having 0 or less life, you win the game instead. (Another player winning the game does not cause you to lose the game.)

Flying
Whenever Immaculate Clouddasher attacks, up to three target creatures gain flying until end of turn.

Immolated Grave enters the battlefield tapped.
{T}: Add {R}.
{2/R}{2/R}: Immolated Grave becomes a 3/1 red Elemental creature with first strike until end of turn. It's still a land.

Enchant creature
Enchanted creature gets +3/+3 and has flying.

Enchant creature
Enchanted creature gets +2/+2 and has trample and indestructible.

Hexproof, indestructible
You don't lose the game for having 0 or less life.
For each 1 life you would lose while you have 0 or less life, instead put a -1/-1 counter on a creature you control with toughness 1 or greater.

As Imperial Barracks enters the battlefield, you may reveal a Mountain or Plains card from your hand. If you don't, Imperial Barracks enters the battlefield tapped.
{T}: Add {R} or {W}.

{T}: Add {C}.
{4}, {T}, Put a -1/-1 counter on a creature you control: Draw a card.

Imperial Marketplace enters the battlefield with a charge counter on it.
{T}: Add {C}.
{T}, Remove a charge counter from Imperial Marketplace: Put a +1/+1 counter on target creature you control.

{T}: Add {C}. Activate only if you have less life and control fewer creatures than each opponent.

{T}: Add {C}.
{1}, Discard Imperial Port: Search your library for a basic land card, reveal it, and put it into your hand. Then shuffle.

Enchant creature
Enchanted creature can block any number of creatures each combat.

{T}: Add {C}.
{T}: Add {C}{C}{C}. Spend this mana only to pay advance costs.

{T}: Add {C}.
{5}, {T}: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

{T}, Pay 1 life: Add {B} or {R}.
{2}, {T}, Sacrifice Industrial District and another permanent: Draw a card. Activate only during your turn.

Whenever you cast a spell, untap Inglorious Blaze.
{T}: Inglorious Blaze deals 1 damage to target player or planeswalker.

{T}: Add one mana of any color.
Whenever you tap Ingrained Virago for mana, each opponent loses 1 life.

Indestructible
{2}{B}, Exile two cards from your graveyard: Each opponent loses 2 life and you gain 2 life.

Inquisitor's Chamber enters the battlefield tapped.
{T}: Add {B}.
{B}{B}, {T}, Sacrifice another permanent: Draw a card.

Inscrutable Realms enters the battlefield tapped unless you control two or more other lands.
{T}: Add {W}.
{T}, Pay 1 life: Add {G} or {U}.

({T}: Add {U}.)
Interlocked Waterways enters the battlefield tapped.
{U}, {T}, Reveal a blue card from your hand: Untap target creature.

{T}: Add {C}.
{1}, {T}: Add two mana of different colors. Activate only if you control five or more lands.

({T}: Add {U}.)
Inundated Sanctuary enters the battlefield tapped with two sanctum counters on it.
{T}, Remove a sanctum counter from Inundated Sanctuary: Add {W} or {B}.

Inviolable Realms enters the battlefield tapped unless you control two or more other lands.
{T}: Add {U}.
{T}, Pay 1 life: Add {W} or {B}.