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I think certain cards from Hearthstone should be fine if they transitioned to MtG with some adjustments. For example:

Naturalize :g:
Instant
Destroy target creature. It can't be regenerated. An...

Some love for red.

Impetus :r::r:
Sorcery
Search your library for a creature card with "This creature attacks each turn if able" and put it onto the battlefield. Then shuffle your library.
...

Æther Fuse :2::u::r:
Instant
Counter target spell. If that spell is countered this way, destroy each permanent that produced mana that was spent to cast it.

Screeching Cobra :g::g::g:
Creature...

Æther Bauble :1:
Artifact
When Æther Bauble enters the battlefield, you may draw a card.
Sacrifice Æther Bauble: You may discard any number of cards, counter any number of spells or other...

Morphing Memories :4::u::u:
Instant
As an additional cost to cast Morphing Memories, a player of your choice discards his or her hand.
The chosen player draws ten cards.

Mana Fading :1::b::b:...

Erghor, Wizardry's Bane :rg::rg:
Legendary Creature - Elf Goblin Mutant
Flash
You may cast red and/or green spells as though they had flash.
Whenever you cast a red or green spell, you may...

Tibalt's Serf :r:
Creature - Devil
Flash
Whenever you discard a card, if you discarded it at random, draw two cards.
When Tibalt's Serf dies, put X loyalty counters on target planeswalker you...

Soul Container seems what?

Soul Container :1:
Artifact Creature - Construct
Soul Container enters the battlefield with X charge counters on it, where X is your life total.
When Soul Container enters the battlefield, your...

Imminent Clash :2::b::b:
Sorcery
Starting with you, each player searches his or her library for a card, reveals it, and puts it into his or her hand. Repeat this process twice, then each player...

Displease :b::r:
Instant
Target player sacrifices a permanent with converted mana cost 1 or greater. That player discards cards equal to the converted mana cost of the sacrificed permanent and...

Primal Instinct :2::r::g:
Sorcery
Target opponent names a card, then you choose a number. That player reveals his or her hand and the cards in his or her library. If the total amount of cards with...

Fleeting Dream :u::r:
Instant
Cast target instant or sorcery card from your graveyard without paying its mana cost, then counter it.
Draw a card.

Entranced Mage :w::u:
Creature - Human Wizard...

Mana Cage DDD
Artifact
As long as Mana Cage is untapped, each player's mana pool can't have more than three mana.

Neutral Suffocation X:b:
Sorcery
Spend only colorless mana on X.
Target...

Freedom of the Tribe :1::r:
Instant
Gain control of target land creature. (This effect lasts indefinitely.)

Mirrored Lightning :r::r:
Creature - Elemental
Flash
You may have Mirrored...

Krenko's Mother-in-Law :r:
Legendary Creature - Goblin Demon
Goblin spells you cast cost :2: less to cast.
Whenever an ability of another Goblin creature you control resolves, put a merit counter...

Kithkin Witchcraft :r::w:
Enchantment
Flash
No more than one land can enter the battlefield under each player's control each turn.
No more than one creature can enter the battlefield under each...

Szadek, Lord of New Ways :u::b:
Legendary Creature - Vampire
Flying, lifelink
T: The next instant or sorcery spell you cast this turn has storm.
"We always have the opportunity to change our...

Irrational Backlash :b::b::r::r:
Enchantment
If Irrational Backlash is in your opening hand, you may begin the game with it on the battlefield.
Whenever an opponent casts a spell that targets you...

World of Randomness :1::r:
Sorcery
Flip a coin 500 times. If you do, you win the game.
"You'd be surprised if you knew under which rules the multiverse actually operates."
- Nicol Bolas
...

Actually I once got a Platinum Emperion reanimated against me, and when he wanted to FoW my bomb, I pointed him that he couldn't pay the FoW's life. When I told a friend, he said "Whoa, I would've...

Æther Paradox :w:
Instant
Rearrange all spells and abilities on the stack.
Draw a card.

Reality Purge :u:
Instant
You draw a card, then each player exiles all cards from his or her library....

Boggart Riot :2::r:
Tribal Instant - Goblin
Boggart Riot can't be countered by spells or abilities.
Destroy target nonland permanent if its converted mana cost is less than or equal to the number...

Guardian of Consequences :1::r::g:
Creature - Elemental
Flash
Guardian of Consequences can't be countered unless a dash cost was paid to cast it.
First strike, reach
Whenever a player puts a...

For Griselbrand specifically, either you give this card split second or he draws 7 cards in response, maybe 14 if he hit you beforehand. Of course, he could then just counter your spell and still get...