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Reveal a card in your hand, then put that card onto the battlefield if it has the same name as a permanent.

Talrand, Sky Summoner

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

Sea Scryer

Ashnod's Altar

High Tide

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

Mystic Remora

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.