Sliver Overlord

Sliver cards in your hand have warp .

Sliver creatures you control have "When this creature enters, conjure a random card from the Slivers Spellbook into the top ten cards of your library at random, then draw a card."

Warp

Flying

: Search your library for a Dragon permanent card and put it into your graveyard. If you do, Scion of the Ur-Dragon becomes a copy of that card until end of turn. Then shuffle.

Flying

When Niv-Mizzet enters, reveal the top ten cards of your library. For each color pair, choose a card that's exactly those colors from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.

When Marina Vendrell enters, reveal the top seven cards of your library. Put all enchantment cards from among them into your hand and the rest on the bottom of your library in a random order.

: Lock or unlock a door of target Room you control. Activate only as a sorcery.

The "legend rule" doesn't apply to Slivers you control.

Each Sliver creature card in your graveyard has encore , where X is its mana value.

Encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

At the beginning of your upkeep, you may search your library and/or graveyard for a Shrine card and put it onto the battlefield. If you search your library this way, shuffle.

If an ability of another Shrine you control triggers while you control six or more Shrines, that ability triggers an additional time.