Well, we'd first have to know some of his backdrop, why he's BG, etc.
+1: search your library for a basic land card, reveal it, put it into play tapped, and shuffle your library
-1: put a 2/2 Zombie Beast token with Intimidate into play.
-5: Until end of turn, whenever a creature you control deals damage to an opponent, you may draw a card and have target player discard a card.
3
Garruk Blightspeaker BGG
Planeswalker - Garruk
+1: Search your library for a land card, reveal it, and put it into your hand.
-X: Destroy each non-land permanent with converted mana cost X or less.
-6: Pick a basic land type. Target player gains an emblem that says "Lands you control are the chosen basic lands."
2
Garruk, the Cursed 2BG
Planeswalker- Garruk
+1: Search your library for a land card and put it into play tapped, then shuffle your library
0: Put a 3/3 Green Beast token with deathtouch into play
-X: Destroy each non-land permanent with converted mana cost X or less
3
This amounts to nothing more than custom card creation. Thread closed.
"Everyone is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing it is stupid."
-Albert Einstein
+1: search your library for a basic land card, reveal it, put it into play tapped, and shuffle your library
-1: put a 2/2 Zombie Beast token with Intimidate into play.
-5: Until end of turn, whenever a creature you control deals damage to an opponent, you may draw a card and have target player discard a card.
3
Keep Custom Card Creation in that subforum
Garruk Blightspeaker BGG
Planeswalker - Garruk
+1: Search your library for a land card, reveal it, and put it into your hand.
-X: Destroy each non-land permanent with converted mana cost X or less.
-6: Pick a basic land type. Target player gains an emblem that says "Lands you control are the chosen basic lands."
2
Keep Custom Card Creation in that subforum
Garruk, the Cursed 2BG
Planeswalker- Garruk
+1: Search your library for a land card and put it into play tapped, then shuffle your library
0: Put a 3/3 Green Beast token with deathtouch into play
-X: Destroy each non-land permanent with converted mana cost X or less
3
Ditto