Warriors Blade comes down as a 4/3 Warrior for four, which is bad everywhere except Limited
Drawing two cards at sorcery speed is worth 3 mana (Divination), but drawing two at instant speed typically costs 4 (Glimmer of Genius)
Consider that many current decks in Shards of Alara Block only have a handful of lands that can even come into play untapped, let alone basics
Zendikar is a world of adventure and reward for those with the courage to brave its perils
An effect may refer to a card, spell, or permanent that "has an Adventure." This refers to a card, spell, or permanent that has an adventurer card's set of alternative characteristics, even if they're not being used and even if that card was never cast as an Adventure
There are also none that cost 2, so you can never play Slightly on curve