Tom Roberts

Atraxa, Praetors' Voice

Flying, vigilance, deathtouch, lifelink
At 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.)

Vivien on the Hunt

+2: You may sacrifice a creature. If you do, search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put it onto the battlefield, then shuffle.
+1: Mill five cards, then put any number of creature cards milled this way into your hand.
−1: Create a 4/4 green Rhino Warrior creature token.

[+2]: You may sacrifice a creature. If you do, search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put it onto the battlefield, then shuffle.
[+1]: Mill five cards, then put any number of creature cards milled this way into your hand.
[−1]: Create a 4/4 green Rhino Warrior creature token.

Riveteers Ascendancy

Whenever you sacrifice a creature, you may return target creature card with lesser mana value from your graveyard to the battlefield tapped. Do this only once each turn.

Ob Nixilis, the Adversary

Casualty X. The copy isn't legendary and has starting loyalty X. (As you cast this spell, you may sacrifice a creature with power X. When you do, copy this spell. The copy becomes a token.)
[+1]: Each opponent loses 2 life unless they discard a card. If you control a Demon or Devil, you gain 2 life.
[−2]: Create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."
[−7]: Target player draws seven cards and loses 7 life.

Elspeth Resplendent // Elspeth Resplendent

Elspeth Resplendent

[+1]: Choose up to one target creature. Put a +1/+1 counter and a counter from among flying, first strike, lifelink, or vigilance on it.
[−3]: Look at the top seven cards of your library. You may put a permanent card with mana value 3 or less from among them onto the battlefield with a shield counter on it. Put the rest on the bottom of your library in a random order.
[−7]: Create five 3/3 white Angel creature tokens with flying.