This spell can't be countered.
Creature spells you control with power 5 or greater can't be countered.

Flying
You have hexproof. (You can't be the target of spells or abilities your opponents control.)

Each player can't draw more than one card each turn.

Destroy target creature and target land.

Enchant creature
As long as enchanted creature is white, it gets +1/+1 and has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)
As long as enchanted creature is blue, it gets +1/+1 and can't be blocked.

Haste
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Flying
When Sunblast Angel enters the battlefield, destroy all tapped creatures.

Sunpetal Grove enters the battlefield tapped unless you control a Forest or a Plains.
: Add or .

Indestructible
As long as your devotion to blue is less than five, Thassa isn't a creature. (Each in the mana costs of permanents you control counts toward your devotion to blue.)
At the beginning of your upkeep, scry 1.
: Target creature you control can't be blocked this turn.

Vigilance

This spell can't be countered.
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
: Regenerate Thrun, the Last Troll.

Return target card from your graveyard to your hand. Exile Treasured Find.

Flying, vigilance
When Twilight Shepherd enters the battlefield, return to your hand all cards in your graveyard that were put there from the battlefield this turn.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Flying, deathtouch, lifelink

: Create a 3/3 green Centaur creature token.
: Populate. (Create a token that's a copy of a creature token you control.)

Other green creatures you control get +1/+1.
Other white creatures you control get +1/+1.
If a spell or ability an opponent controls causes you to discard Wilt-Leaf Liege, put it onto the battlefield instead of putting it into your graveyard.

Indestructible
As long as your devotion to red and green is less than seven, Xenagos isn't a creature.
At the beginning of combat on your turn, another target creature you control gains haste and gets +X/+X until end of turn, where X is that creature's power.

[+1]: Add X mana in any combination of and/or , where X is the number of creatures you control.
[0]: Create a 2/2 red and green Satyr creature token with haste.
[−6]: Exile the top seven cards of your library. You may put any number of creature and/or land cards from among them onto the battlefield.