msem-instigator

{T}: Add {C}.
{T}: Add one mana of any color. Activate only if you have a counter.

As long as your deck contains only black and colorless cards, your minimum deck size is reduced by eight.

Indestructible
Whenever Hannaru the Conqueror attacks, put a +1/+1 counter on each creature you control.

Flying
At the beginning of your precombat main phase, you may put any number of land cards from your hand onto the battlefield, then draw a card for each land put onto the battlefield this way.

Haughty Chateau enters the battlefield tapped unless you have two or more opponents.
{T}: Add {W} or {B}.

{T}: Add {C}.
{T}, Pay 1 life: Add {B} or {G}.

Haunted Estate enters the battlefield tapped unless another player controls a land that could produce {W} or {B}.
{T}: Add {W} or {B}.

{T}: Add {C}.
{T}, Reappropriate: Add {U} or {R}. (Exile exactly two cards from your hand and/or graveyard.)

{W}: Target creature assigns combat damage equal to its toughness rather than its power this turn.

Haunted Hovel enters the battlefield tapped.
{T}: Add {W} or {B}.
When Haunted Hovel enters the battlefield, you may put a loyalty counter on a planeswalker you control.

{T}, Pay 1 life: Add {W} or {U}.
{2}, {T}, Sacrifice Haunted Manor and another permanent: Draw a card. Activate only during your turn.

Haunted Woodlock enters the battlefield tapped unless you have two or more opponents.
{T}: Add {B} or {G}.

Whenever Haunting Maestro attacks, you may tap or untap up to two target creatures.

Hazy Coppice enters the battlefield tapped.
{T}: Add {U} or {B}.
{2}{U}{B}: Until end of turn, Hazy Coppice becomes a 4/4 blue and black Bird creature with with flying and “Whenever this creature attacks or blocks, torment yourself.” It's still a land. (To torment yourself, lose 3 life unless you discard a card or sacrifice a nonland permanent.)

{T}, Sacrifice Hazy Lagoon: Search your library for a Plains or Island card and put it onto the battlefield tapped, then shuffle.

({T}: Add {U} or {B}.)
Hazy Moorland enters the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

Hazy Summits enters the battlefield tapped.
{T}: Add {R} or {W}.
{1}, {T}: Add one mana of any color.

When Healing Center enters the battlefield, you gain 2 life.
{T}: Add {C}.

{T}: Add {C}.
{3}, {T}: Choose a color. For each differently named land you control, add one mana of that color.

({T}: Add {G} or {W}.)
Heart of the Glade enters the battlefield tapped unless you control a basic Forest or a basic Plains.

Flying, vigilance, deathtouch, lifelink

Enchant creature
When Heartstrings leaves the battlefield, exile enchanted creature.
Whenever enchanted creature attacks or blocks, exile it at end of combat.

{T}: Add {C}.
When Heavenly Temple enters the battlefield, target creature gains flying until end of turn.
{2}: Return Heavenly Temple from the battlefield to its owner's hand.

{T}, Pay 1 life: Add {U} or {R}.
{1}, {T}, Sacrifice Heist Headquarters: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Hellfire Caverns enters the battlefield tapped.
{T}: Add {R}.
{2}{R}: Until end of turn, Hellfire Caverns becomes a 3/3 Devil creature with menace. Activate only if you're horrific.