Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of enchantments you control.
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
". . . we will no longer sit idly by, fearing for our lives! To that end . . ."
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
". . . we demand a repeal of those ridiculous sumptuary laws. Additionally . . ."
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
". . . the king's burning heart must be laid to rest at last. And furthermore . . ."
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
"...cake. The Overmind demands cake. The Overmind also requires that..."
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
". . . a decreased duration of synodic months would be most welcome. Also . . ."
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
". . . the communal bone garden is in dire need of new vertebrae, plus . . ."
{1}, {T}: Target player mills a card. Tap four untapped Advisors you control: Target player mills twelve cards. A deck can have any number of cards named Persistent Petitioners.
". . . you must open the gates of the Shredforge to all, but also . . ."
Creatures you control get +1/+1 and have flying and indestructible. At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact.
{T}: Add {C}. {4}, {T}: Investigate. At the beginning of your end step, if you sacrificed three or more Clues this turn, transform Havengul Laboratory.
"Today, we make history. Today, we make contact." —Dr. Martin Brenner
When this land transforms into Havengul Mystery, return target creature card from your graveyard to the battlefield. When the creature put onto the battlefield with Havengul Mystery leaves the battlefield, transform Havengul Mystery. {T}, Pay 1 life: Add {B}.
Sliver creatures you control have "When this creature enters, you may exile target creature an opponent controls until this creature leaves the battlefield."
Slivers are often seen toying with enemies they capture, not out of cruelty, but to fully learn their physical capabilities.
All Sliver creatures have flying. All Slivers have "If this permanent would be put into a graveyard, you may put it on top of its owner's library instead."
Like a great bellows it hisses, and its kin, both living and dead, are lifted to safety.