Whenever equipped creature attacks, it gets +X/+0 until end of turn, where X is its power. Equip {3}({3}: Attach to target creature you control. Equip only as a sorcery.)
Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.) Enchanted creature gets +1/+3. Whenever enchanted creature attacks, you gain 1 life.
Enchant land (Target a land as you cast this. This card enters the battlefield attached to that land.) Enchanted land has “{T}: Add one mana of any color” and “At the beginning of each upkeep, untap this land.”
When Blightbringer enters the battlefield, creatures your opponents control get -1/-1 until end of turn. Unearth {3}{B}({3}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)
When Blighting Ooze enters the battlefield, put a -1/-1 counter on each of up to X target creatures. As long as Blighting Ooze is on the battlefield, it has all activated abilities of each creature with a -1/-1 counter on it.
Engorge (As this enters the battlefield, mill three cards, then exile a card from among the milled cards.) When Blood Servant enters the battlefield, if it engorged a creature card, you draw a card and you lose 2 life.
Flying (This creature can't be blocked except by creatures with flying or reach.) When Blood-Tithe Harpy enters the battlefield, target player loses 1 life and you gain 1 life.
Engorge (As this enters the battlefield, mill three cards, then exile a card from among the milled cards.) When Bloodchill Risen enters the battlefield, if it engorged an instant card, return target creature to its owner's hand.
Equipped creature gets +1/+1 for each charge counter on Bloodstained Knife. {2}, Sacrifice a creature: Put a charge counter on Bloodstained Knife. Equip {2}({2}: Attach to target creature you control. Equip only as a sorcery.)