Flying, vigilance, deathtouch, lifelinkAt the beginning of your end step, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Changeling (This card is every creature type.)As Morophon enters, choose a creature type.Spells of the chosen type you cast cost less to cast. This effect reduces only the amount of colored mana you pay.Other creatures you control of the chosen type get +1/+1.
FlyingWhenever Scourge of Valkas or another Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control.: Scourge of Valkas gets +1/+0 until end of turn.
Trample, infect, indestructibleIf Blightsteel Colossus would be put into a graveyard from anywhere, reveal Blightsteel Colossus and shuffle it into its owner's library instead.
When Avenger of Zendikar enters, create a 0/1 green Plant creature token for each land you control.Landfall — Whenever a land you control enters, you may put a +1/+1 counter on each Plant creature you control.
: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.: Gain control of target Sliver. (This effect lasts indefinitely.)
Whenever a Dragon you control enters, put a gold counter on Dragon's Hoard., Remove a gold counter from Dragon's Hoard: Draw a card.: Add one mana of any color.
Whenever a Warrior attacks, you may have its controller create a 1/1 white Warrior creature token that's tapped and attacking.: Untap all attacking creatures. They gain trample, lifelink, and haste until end of turn. After this phase, there is an additional combat phase. Activate only during combat.
Menace, hasteBoast — Sacrifice another creature or artifact: This creature deals damage equal to 2 plus the sacrificed permanent's mana value to any target. (Activate only if this creature attacked this turn and only once each turn.)