Etrata, the Silencer can’t be blocked. Whenever Etrata deals combat damage to a player, exile target creature that player controls and put a hit counter on that card. That player loses the game if they own three or more exiled cards with hit counters on them. Etrata’s owner shuffles Etrata into their library. 3/5
Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) Windbrisk Heights enters tapped. {T}: Add {W}. {W}, {T}: You may play the exiled card without paying its mana cost if you attacked with three or more creatures this turn.
Destroy target nonbasic land you don’t control and target nonbasic land of an opponent’s choice you don’t control. Volcanic Offering deals 7 damage to target creature you don’t control and 7 damage to target creature of an opponent’s choice you don’t control.
Target opponent puts the cards from their hand on top of their library. Search that player’s library for that many cards. The player puts those cards into their hand, then shuffles.
Flying When Sower of Temptation enters, gain control of target creature for as long as Sower of Temptation remains on the battlefield. 2/2
Constellation — Whenever Eidolon of Blossoms or another enchantment you control enters, draw a card. 2/2
{2}{R}, {T}: Create a token that’s a copy of target creature card in your graveyard, except it’s an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step. 2/3
Split second (As long as this spell is on the stack, players can’t cast spells or activate abilities that aren’t mana abilities.) Choose target card in a graveyard other than a basic land card. Search its owner’s graveyard, hand, and library for all cards with the same name as that card and exile them. Then that player shuffles.
[+1]: Until end of turn, Gideon, Ally of Zendikar becomes a 5/5 Human Soldier Ally creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn. [0]: Put a 2/2 white Knight Ally creature token onto the battlefield. [-4]: You get an emblem with "Creatures you control get +1/+1."
Take an extra turn after this one. Exile Part the Waterveil. Awaken 6—{6}{U}{U}{U} (If you cast this spell for {6}{U}{U}{U}, also put six +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It’s still a land.)
Whenever a creature with power 4 or greater enters the battlefield under your control, draw a card. [-1]: Untap target permanent.
Look at target player’s hand. Target player discards all non-land cards in his or her hand.
Delirium — If a source you control would deal noncombat damage to a permanent or player while there are four or more card types among cards in your graveyard, it deals double that damage instead. When The Rollercrusher Ride enters, it deals X damage to each of up to X target creatures.