You may pay 1 life and exile a blue card from your hand rather than pay Force of Will's mana cost.
Counter target spell.

Exile target creature. Its controller gains life equal to its power.

, Pay 1 life, Sacrifice Flooded Strand: Search your library for a Plains or Island card and put it onto the battlefield. Then shuffle your library.

: Add to your mana pool.
, Sacrifice Wasteland: Destroy target nonbasic land.

You may return an Island you control to its owner's hand rather than pay Daze's mana cost.
Counter target spell unless its controller pays .

Draw three cards, then put two cards from your hand on top of your library in any order.

When Stoneforge Mystic enters the battlefield, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle your library.
, : You may put an Equipment card from your hand onto the battlefield.

CLICK TO TRANSFORM

At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If an instant or sorcery card is revealed this way, transform Delver of Secrets.

Flying

Counter target activated or triggered ability. (Mana abilities can't be targeted.)

Counter target spell with converted mana cost 2.

Put two 1/1 white Spirit creature tokens with flying onto the battlefield.
Flashback

Look at the top three cards of your library, then put them back in any order. You may shuffle your library.
Draw a card.

, Pay 1 life, Sacrifice Marsh Flats: Search your library for a Plains or Swamp card and put it onto the battlefield. Then shuffle your library.

, Pay 1 life, Sacrifice Polluted Delta: Search your library for an Island or Swamp card and put it onto the battlefield. Then shuffle your library.

Flash
When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost.

Living weapon
Equipped creature gets +4/+4 and has vigilance and lifelink.
: Return Batterskull to its owner's hand.
Equip

Equipped creature gets +2/+2 and has protection from red and from blue.
Whenever equipped creature deals combat damage to a player, Sword of Fire and Ice deals 2 damage to target creature or player and you draw a card.
Equip

Whenever equipped creature deals combat damage, put two charge counters on Umezawa's Jitte.
Remove a charge counter from Umezawa's Jitte: Choose one - Equipped creature gets +2/+2 until end of turn; or target creature gets -1/-1 until end of turn; or you gain 2 life.
Equip

Each player who has cast a nonartifact spell this turn can't cast additional nonartifact spells.

Target creature gets -1/-1 until end of turn.
Dredge 3

Destroy all green creatures. They can't be regenerated.

( can be paid with either or 2 life.)
Choose target card in a graveyard other than a basic land card. Search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. Then that player shuffles his or her library.

Counter target noncreature spell unless its controller pays .

Destroy target artifact or enchantment.

: Target player exiles a card from his or her graveyard.
, Exile Relic of Progenitus: Exile all cards from all graveyards. Draw a card.