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Word of Seizing

Split second (As long as this spell is on the stack, players can’t cast spells or activate abilities that aren’t mana abilities.)
Untap target permanent and gain control of it until end of turn. It gains haste until end of turn.

Rarity : Rare
Types : instant
Artist : Vance Kovacs
Flavor : "Obey!"
Cost converted to mana : 5

Rulings

7 June 2013
Players still get priority while a card with split second is on the stack.
7 June 2013
Split second doesn’t prevent players from activating mana abilities.
7 June 2013
Split second doesn’t prevent triggered abilities from triggering. If one does, its controller puts it on the stack and chooses targets for it, if any. Those abilities will resolve as normal.
7 June 2013
Split second doesn’t prevent players from performing special actions. Notably, players may turn face-down creatures face up while a spell with split second is on the stack.
7 June 2013
Casting a spell with split second won’t affect spells and abilities that are already on the stack.
7 June 2013
If the resolution of a triggered ability involves casting a spell, that spell can’t be cast if a spell with split second is on the stack.

Magus of the Wheel

{1}{R}, {T}, Sacrifice Magus of the Wheel: Each player discards their hand, then draws seven cards.

Crystalline Crawler

Converge — Crystalline Crawler enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it. Remove a +1/+1 counter from Crystalline Crawler: Add one mana of any color. {T}: Put a +1/+1 counter on Crystalline Crawler.