Vivid Grove enters tapped with two charge counters on it.
: Add .
, Remove a charge counter from Vivid Grove: Add one mana of any color.

: Add one mana of any color. Spend this mana only to cast a creature spell.

(: Add .)

(: Add .)

Rootbound Crag enters tapped unless you control a Mountain or a Forest.
: Add or .

(: Add .)

, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

(: Add .)

Vivid Creek enters tapped with two charge counters on it.
: Add .
, Remove a charge counter from Vivid Creek: Add one mana of any color.

Rupture Spire enters tapped.
When Rupture Spire enters, sacrifice it unless you pay .
: Add one mana of any color.

(: Add .)

All Sliver creatures have poisonous 1. (Whenever a Sliver deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)

All Slivers have shroud. (They can't be the targets of spells or abilities.)

All Slivers have ": Add one mana of any color."

All Slivers have ": Regenerate this permanent."

Whenever a Sliver becomes blocked, that Sliver gets +1/+1 until end of turn for each creature blocking it.

All Sliver creatures get +1/+1.

Flash
Any player may cast Sliver spells as though they had flash.

All Slivers have "Pay 2 life: Return this permanent to its owner's hand."

Changeling (This card is every creature type.)
: Target creature gains all creature types until end of turn.
: Target creature loses all creature types until end of turn.

All Sliver creatures have frenzy 1. (Whenever a Sliver attacks and isn't blocked, it gets +1/+0 until end of turn.)

All Sliver creatures have haste.

All Slivers have ", Sacrifice this permanent: This permanent deals 2 damage to any target."

All Sliver creatures have flying.

All Slivers have ", Sacrifice this permanent: You gain 4 life."

All Sliver creatures have ": This creature gets +1/+0 until end of turn."

Each Sliver card in each player's hand has slivercycling .
Slivercycling (, Discard this card: Search your library for a Sliver card, reveal it, put it into your hand, then shuffle.)

All Slivers have ", Sacrifice this permanent: Destroy target permanent."

All Sliver creatures have ": This creature gets +1/+1 until end of turn."

All Sliver creatures have ": This creature gets +0/+1 until end of turn."

Activated abilities of creatures cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

Choose a creature type. Draw a card for each permanent you control of that type.

Return up to three target creature cards of the creature type of your choice from your graveyard to your hand.

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)

All Sliver creatures get +2/+2.