MTG Salvation

So you have all 3 out, 4 lands, and you just untapped to start your turn 5. You play a fetch from graveyard and crack it.
-5 lands, 9 mana to spend.
Valakut pseudo draws you 4 cards

How abusive is this? You play Arboreal Grazer. Now you have 10 mana to spend, and you've pseudo drawn 6 cards. We're still on turn 5. You've had, in effect, 6 landfall triggers. You can cast Uro, and get all 3 mana right back. You can chain Nahiri's Lithoforming in a variety of ways.
Seriously, pick your win con, like anything. You've drawn 6 cards and have 10 mana to spend on turn 5

Grazer? Not standard legal starting next Friday.

Any land you play gives you 5 mana, assuming it's a fetch. Play and crack is 4 cobra triggers and the land itself. So essentially, any 5 mana card that plays an extra land untapped... is free. Why nitpick, that's gross. You just keep replaying that same fetch with greenwarden. If growth spiral is legal, it's dark ritual + draw 3 that even color fixes, Ummmm.

You need a two drop creature and a 6 drop creature to live through your untap step. Considering you can die on turn 4 from red decks I don't see how a combo that is stopped by any one piece of removal is all that great.

Or it's a combo that draws 2 additional cards per turn and thins your deck. Literally just named an engine that can create infinite mana, infinite creatures, infinite, draw, an army of 10/10 landfallers. ... theres so many routes you can take and all 3 cards are good on this own. Cobra puts out greenwarden on turn 4 with minimal effort. So I have 24 cards to stop RDW?

You need Cobra to live and you need a Fabled Passage specifically to use cobra to get Greenwarden into play on turn 4. Take a look at all the winning decklists right now and see why Greenwarden isn't being played. Heck if you want mana run Nyx-bloom ancient. For one mana more than greenwarden he'll triple your mana as a single card.

Add black? Quite a few black cards in zendikar for killing creatures and creature recursion. Play a land, draw a card, in enchantment form is barely in any decks that I've seen. Let alone top ten lists. Draw a card is the most powerful line of text a magic card can have. Does anyone have an updated standard rotation list, which set is rotating?

Wizards does seem to be steering away from a balanced strategic game and towards powerful cards that need to get banned and decks that build themselves