Blocking creatures get +1/+1 until end of turn.

Whenever Razorclaw Bear becomes blocked, it gets +2/+2 until end of turn.

Buyback—Sacrifice a land. (You may sacrifice a land in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
You gain 2 life.

Plainswalk (This creature can't be blocked as long as defending player controls a Plains.)

Snow forestwalk (This creature can't be blocked as long as defending player controls a snow Forest.)

Flying
When Ringskipper dies, clash with an opponent. If you win, return Ringskipper to its owner's hand. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher converted mana cost.)

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Creatures named Scissors Lizard can't attack or block.

When Rooting Kavu dies, you may exile it. If you do, shuffle all creature cards from your graveyard into your library.

Whenever Rysorian Badger attacks and isn't blocked, you may exile up to two target creature cards from defending player's graveyard. If you do, you gain 1 life for each card exiled this way and Rysorian Badger assigns no combat damage this turn.

Whenever a player kicks a spell, you create a 1/1 green Saproling creature token.

Flying
When Sawtooth Loon enters the battlefield, return a white or blue creature you control to its owner's hand.
When Sawtooth Loon enters the battlefield, draw two cards, then put two cards from your hand on the bottom of your library.

Creatures named Paper Tiger can't attack or block.

: Scrapbasket becomes all colors until end of turn.

Flying
When Screaming Seahawk enters the battlefield, you may search your library for a card named Screaming Seahawk, reveal it, and put it into your hand. If you do, shuffle your library.

Flying
When Screeching Buzzard dies, each opponent discards a card.

When Scrivener enters the battlefield, you may return target instant card from your graveyard to your hand.

, : Exile any number of cards from your hand face down. Put that many cards from the top of your library into your hand. Then look at the exiled cards and put them on top of your library in any order.

You may have Sculpting Steel enter the battlefield as a copy of any artifact on the battlefield.

, : Search your library for a Merfolk permanent card and put it onto the battlefield. Then shuffle your library.