Other Merfolk creatures you control get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Whenever a Sliver creature you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}.

Illusion creatures you control get +1/+1 and have hexproof. (They can't be the targets of spells or abilities your opponents control.)

All Sliver creatures have reach.

Other Elf creatures you control get +1/+1. {T}: Add {G} for each Elf you control.

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

{T}: Add X mana of any one color, where X is the number of Allies you control.

{X}, {T}: Untap X target lands.

Sliver creatures you control have "{T}: Add one mana of any color."

Tap an untapped Wizard you control: Draw a card.

At the beginning of combat on your turn, each Merfolk creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the exploring creature, then put the card back or put it into your graveyard.) Whenever Hakbal attacks, you may put a land card from your hand onto the battlefield. If you don't, draw a card.

Sliver creatures you control have flying.

Horsemanship (This creature can't be blocked except by creatures with horsemanship.) Other Knights you control have horsemanship.

All Sliver creatures have trample.

Wurms you control get +2/+2 and have trample. {7}{G}, {T}: Create a 4/4 green Wurm creature token. This ability costs {X} less to activate, where X is the greatest power among Wurms you control.