The Best Cards With Split Second Spells with split second tend to cost a little more mana than their more interactive equivalents, so the best ones are either mechanically unique spells or effects that you need to resolve without your opponents' interference
Draw three cards
Due to the nature of how Magic is played, capitalizing on a game mechanic thats bound to happen on every player's turn like drawing cards is always going to be a desirable effect, and can in some cases turn into too much of an advantage or unlock play patterns that dont sit well with the community
Anytime another creature comes into play, you get to pick between adding three green mana, placing a +1/+1 counter on all creatures you control, or perhaps most importantly, scrying 2 and then drawing a card
Cards that can untap Garth cheaply, like Freed from the Real and Kioras Follower, will let you cast multiple spells from his book per turn
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