Gray Viking Games is a reliable option and we've written up a pretty comprehensive review for GVG, which I highly recommend you take a look at
However, if you attack one opponent with three Birds, you'll only get one effect trigger as only one player was dealt damage
Can You Damage Battles With Spells

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They get uncastable giant creatures out of our hand and into the graveyard, they refill our hand with fresh gas to play, and of course, they trigger Sefris (so long as we discard at least one creature)
The cards are hand cut into the shape and size of a normal MTG card from an Uncut sheet of cards