For example (going into weird low power world for a moment, hold on) One of the ways that my R/G or RUG control decks function is that they run cards like these: These are all cards that you can drop early, and just buy some time with, so the control decks can build up their mana base, allowing them to hit a red sweeper: Two of the cards even directly play into that plan by grabbing mana sources
This is of course only practical, if you know the expansion symbols
Firdoch Core is a rare non-creature example of the same principle: not a particularly efficient mana rock, but one which may feel more playable to typal decks since it counts as a hit for Gathering Stone (another great Lorwyn Eclipsed uncommon) and similar effects
Instant - Trap Whisperwood Elemental At the beginning of your end step, manifest the top card of your library
ONE PIECE CARD GAME OP07-109 Super Rare card
Victims are lucky if they remember ever having had what was lost