Herald of Secret Streams [Ixalan Prerelease Promos]Set: Ixalan Prerelease Promos Type: Creature Merfolk Warrior Rarity: Rare Cost: {3}{U} Creatures you control with +1 +1 counters on them can't be blocked. "You might as well try to stop the waterfall."

the Preserver enters the battlefield

nonland card

Set: Kaladesh Prerelease Promos Type: Enchantment Rarity: Rare Cost: {W} Creatures your opponents control enter the battlefield tapped

Sacrifice Aura of Silence: Destroy target artifact or enchantment

you may cast that card from exile without paying its mana cost

When Necromancy enters the battlefield

Set: Fifth Dawn Type: Artifact Rarity: Rare Cost: {3} You may play lands from your graveyard

{R}: Enchanted creature gets +1/+0 until end of turn

Overlord of Grixis

Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void

you may gain 1 life

Exile Eldritch Evolution