Cantrip

A cantrip is spell, usually with a low casting cost, that draws a card in addition to its other effects and can therefore be said to replace itself. Cantrips are included in decks for varying reasons. A cantrip can effectively "thin" a deck, so more useful cards can be drawn faster, while at the same time not losing card advantage. It can also inexpensively increase the amount of spells played in a turn, which is a key factor in some decks. Some cantrips have additional effects, which can serve as an answer to an obstacle in play.

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Slowtrips

Cantrips were introduced in the Ice Age set, where the effect read "Draw a card at the beginning of next turn's upkeep." Starting with Weatherlight, this has been shortened to "Draw a card." The Ice Age cantrips are also referred to as "slowtrips" because they are slower then drawing a card immediately.