Sydri, Galvanic Genius

Flying When Derevi enters and whenever a creature you control deals combat damage to a player, you may tap or untap target permanent. 1GWU: Put Derevi onto the battlefield from the command zone.

Whenever a creature attacks one of your opponents or a planeswalker an opponent controls, that creature gets +2/+0 until end of turn.

Flying When Jeleva enters, each player exiles the top X cards of their library, where X is the amount of mana spent to cast Jeleva. Whenever Jeleva attacks, you may cast an instant or sorcery spell from among cards exiled with Jeleva without paying its mana cost.

Marath enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it. X, Remove X +1/+1 counters from Marath: Choose one — • Put X +1/+1 counters on target creature. X can't be 0. • Marath deals X damage to any target. X can't be 0. • Create an X/X green Elemental creature token. X can't be 0.

3RGW, T: Look at the top five cards of your library. You may put a creature card with power 5 or greater from among them onto the battlefield. Put the rest on the bottom of your library in any order.

At the beginning of each player's draw step, that player draws an additional card. Whenever an opponent draws a card, Nekusar deals 1 damage to that player.

At the beginning of your upkeep, you gain 2 life. Whenever you gain life, you may pay 1. If you do, draw a card and each opponent loses 1 life. At the beginning of your upkeep, if Oloro is in the command zone, you gain 2 life.

When you cast this spell, create X 0/1 red Kobold creature tokens named Kobolds of Kher Keep, where X is the amount of mana spent to cast it. Flying Sacrifice another creature: Prossh gets +1/+0 until end of turn.