Underground River

Draw cards equal to the mana value of target artifact or creature you control. An opponent gains control of that permanent.

2WW, T, Exile Urza's Sylex: Each player chooses six lands they control. Destroy all other permanents. Activate only as a sorcery. When Urza's Sylex is put into exile from the battlefield, you may pay 2. If you do, search your library for a planeswalker card, reveal it, put it into your hand, then shuffle.

Exile target nonland permanent an opponent controls and all tokens that player controls with the same name as that permanent.

When this creature enters, put two +1/+1 counters on target creature you control. Unearth 2GG (2GG: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Vigilance When Loran enters, destroy up to one target artifact or enchantment. T: You and target opponent each draw a card.

At the beginning of your upkeep, scry 2. Whenever you choose to put one or more cards on the bottom of your library while scrying, exile that many cards from the bottom of your library. During your turn, you may play cards exiled with The Temporal Anchor.

T: Add two mana in any combination of colors. Spend this mana only to cast creature spells or activate abilities of creature sources. Whenever you cast a creature spell with power 5 or greater, put a +1/+1 counter on Gwenna and untap it.

T: Add C. T: Add B or G. This land deals 1 damage to you.