Used offensively:
2 cards + 1 turn + 5

+ ~ cost for a dragon.
A dragon costs 10

+ 1 card.
2 cards + 5

~= 1 card + 7

.
I do not think 1 turn + the miniscule cost for whatever other creature is the same as 3

.
Used defensively (as in with antimatter):
2 cards + 1 turn + 5

+ 8

= removal of a creature, around 10hp per turn.
The above is worth around 1 card + 13

+ 1 turn.
Removing a creature is worth around 2-3

.
Sanct heals 4hp per turn for 4

+ 1 card. 2.5 sancts = 10

+ 2.5 cards ~= 1 card + 13

.
1 card + 13

+ 1 turn =?= 1 card + 15-16

Here again, 1 turn is worth 3

, which I do not really agree with.