Hissing Quagmire enters the battlefield tapped. {T}: Add {B} or {G}. {1}{B}{G}: Hissing Quagmire becomes a 2/2 black and green Elemental creature with deathtouch until end of turn. It's still a land.
Whenever Historian's Boon or another nontoken enchantment enters the battlefield under your control, create a 1/1 white Soldier creature token. Whenever the final chapter ability of a Saga you control triggers, create a 4/4 white Angel creature token with flying and vigilance.
Enchant artifact or creature When Historian's Wisdom enters the battlefield, if enchanted permanent is a creature with the greatest power among creatures on the battlefield, draw a card. As long as enchanted permanent is a creature, it gets +2/+1.
Hithlain Rope can't be sacrificed. {1}, {T}: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. The player to your right gains control of Hithlain Rope. {2}, {T}: Draw a card. The player to your right gains control of Hithlain Rope.
If you control two or more other lands, Hive of the Eye Tyrant enters the battlefield tapped. {T}: Add {B}. {3}{B}: Until end of turn, Hive of the Eye Tyrant becomes a 3/3 black Beholder creature with menace and "Whenever this creature attacks, exile target card from defending player's graveyard." It's still a land.
Whenever Hiveheart Shaman attacks, you may search your library for a basic land card that doesn't share a land type with a land you control, put that card onto the battlefield, then shuffle. {5}{G}: Create a 1/1 green Insect creature token. Put X +1/+1 counters on it, where X is the number of basic land types among lands you control. Activate only as a sorcery.
Creatures you control are Slivers in addition to their other creature types.
Rath's evincars used hivestones to control the slivers, but the overlay put their power into unwitting hands. Now the stones make not masters, but slaves.
Flash Whenever a creature deals combat damage to you, if Hixus, Prison Warden entered the battlefield this turn, exile that creature until Hixus leaves the battlefield.
Convoke Flying When Hoarding Broodlord enters the battlefield, search your library for a card, exile it face down, then shuffle. For as long as that card remains exiled, you may play it. Spells you cast from exile have convoke.
Flying When Hoarding Dragon enters the battlefield, you may search your library for an artifact card, exile it, then shuffle. When Hoarding Dragon dies, you may put the exiled card into its owner's hand.