7th Edition

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

Flying

Defender (This creature can't attack.) Flying

Flying Whenever Sustainer of the Realm blocks, it gets +0/+2 until end of turn.

When Staunch Defenders enters the battlefield, you gain 4 life.

{W}{W}, {T}: Destroy target red permanent.

Flying {T}: Target attacking or blocking creature gets +2/+2 until end of turn.

Phyrexian Colossus doesn't untap during your untap step. Pay 8 life: Untap Phyrexian Colossus. Phyrexian Colossus can't be blocked except by three ...

Yavimaya Enchantress gets +1/+1 for each enchantment on the battlefield.

When Wood Elves enters the battlefield, search your library for a Forest card and put that card onto the battlefield. Then shuffle your library.

{W}{W}, {T}: Destroy target black permanent.

Treefolk Seedlings's toughness is equal to the number of Forests you control.

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

{T}: Untap target creature.

You may have Pride of Lions assign its combat damage as though it weren't blocked.

You may have Lone Wolf assign its combat damage as though it weren't blocked.

{1}{G}: Regenerate Gorilla Chieftain.

Whenever Gang of Elk becomes blocked, it gets +2/+2 until end of turn for each creature blocking it.

{T}: Add {G}{G}.

{T}: Femeref Archers deals 4 damage to target attacking creature with flying.

{G}, {T}, Sacrifice Elvish Lyrist: Destroy target enchantment.