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Flying
At the beginning of combat on your turn, up to one target Blood token you control becomes a 2/2 black Bat creature with flying and haste in addition to its other types.
Blood tokens that become Bats with Bloodbat Summoner's ability are still artifact Blood tokens and still have “{1}, {T}, Discard a card, Sacrifice this artifact: Draw a card.”
Voldaren Bloodcaster's last ability checks how many Blood tokens you have both as it triggers and as it resolves. If you don't control at least five Blood tokens at both of those times, it won't transform.
