Enchant creatureEnchanted creature gets +2/+2 and has ": Regenerate this creature." (The next time the creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)
When Rosethorn Halberd enters, attach it to target non-Human creature you control.Equipped creature gets +2/+1.Equip (: Attach to target creature you control. Equip only as a sorcery.)
Whenever equipped creature attacks, defending player reveals cards from the top of their library until they reveal a land card. The creature gets +1/+0 until end of turn for each card revealed this way. That player puts the revealed cards into their graveyard.Equip
Threshold — As long as seven or more cards are in your graveyard, Treacherous Werewolf gets +2/+2 and has "When Treacherous Werewolf dies, you lose 4 life."
FlyingWhenever Purifying Dragon attacks, it deals 1 damage to target creature defending player controls. If that creature is a Zombie, Purifying Dragon deals 2 damage to it instead.
When Barbed Spike enters, create a 1/1 colorless Thopter artifact creature token with flying, then attach Barbed Spike to it.Equipped creature gets +1/+0.Equip
Imprint — When Phyrexian Ingester enters, you may exile target nontoken creature.Phyrexian Ingester gets +X/+Y, where X is the exiled creature card's power and Y is its toughness.
As long as you control a Plains, Sejiri Merfolk has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)
: Savage Knuckleblade gets +2/+2 until end of turn. Activate only once each turn.: Return Savage Knuckleblade to its owner's hand.: Savage Knuckleblade gains haste until end of turn.
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)Whenever you cast a noncreature spell, Seeker of the Way gains lifelink until end of turn.